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List of Vintage Hand-held Calculators
&
Addendum to 'The Collector's Guide to Pocket Calculators'
"J–O"

The Collector's Guide to Pocket Calculators lists over 1,500 models of early pocket calculators from over 220 companies and provides an excellent source of information on early hand-held calculators.  However, since it was published further models have come to light and are listed here.

If you have an early pocket calculator (from the 1970s with LED, vacuum fluorescent, discharge, or early LCD display, and battery powered) which is not in The Collector's Guide, please email the details as in the list below for inclusion here.

Details for each calculator are required in the format used in the book, and below:
Manufacturer or Trading Company, Model Name or Number (there may be more than one), Functions, Display Type, Battery type (and if rechargeable), Size, Country of Manufacture, any Interesting Features.

A small frontal photograph (jpeg format, about 600 pixels max dimension) of each would be useful and will be included with the details if of good quality.
Please email with details.

New Calculators

Latest Update - latest additions have the date added.

Displays are 8-digits unless described otherwise.

Go to   J   K   L   M   N   O

 

J

JANON

• LED 3000, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a 'Standard type 1' calculator.

Japy (French watch manufacturer)

• 103, similar to the Unicom 103.

JCE (John Colling Enterprises, Palo Alto, California, U.S.A.)

• 33W Clock/Radio, 4-functions, red LED, with Klixon keyboard, mounted in smart wood casing. Photo.
• ALK (also seen is ALK-1), 4-functions, red LED, 5-AA batt.
• Mark II, listed in book.
• Percent, listed in book. Photo.
• Super "D", listed in book.

JC Penney (U.S. department store)

• 2300, listed in book.
• 2310, listed in book.
• 3210, listed in book.
• 5000, listed in book.
• GL-986R, listed in book.
• GL-996R, listed in book.
• MM3R, listed in book. Photo, inside.
• MM3MW 4-funct, mem, red LED, sealed batt, 3.0x4.0", made by and same as Commodore MM3 model, United Kingdom. Photo

JEFFERSON

• 676, 4-function RPN, 6-digits red LED, 9v PP3 rep. batt., U.S.A., has membrane keyboard.
• CA-6, 4-function RPN, 6-digits red LED, 9v PP3 rep. batt., U.S.A., has membrane keyboard.

JE

• 408, 4-function, %, memory, red LED. Photo.

JET

• K-80M, 4-function, amber gas-discharge in separate tubes, 4-C rep. batt., Japan, similar to J.T.A. 8P.
• KM-800, 4-function, %, red LED, PP3 rep. batt., 74x120x25mm / 2.9x4.75x1.25", Japan, c1973. photo , inside.

JetSet

• EC-8, 4-function, red display, 4-C rep. batt., Japan, battery-level meter.

JOYSONIC

• 3000, 4-function, %, memory, red LED, 9v PP3 rep. batt., a 'Standard type 1' calculator.

J.T.A. (sold mail-order by J.T.A. of 7 Weir Road, Balham, London, SW 12)

• 8P, 4-function, amber tubes, battery-level meter, 4-C rep. batt., 216x120x32mm / 8.5x4.75x1.25", Japan, similar to models manufactured by Teal. photo.

JULIETTE

• 890P, 4-function, %, red LED, 9v PP3 rep. batt., similar to Calfax 890P.

JUNIOR

• EL-601, 4-function, %, memory, red LED, 9v PP3 rep. batt.

 

K

KARR + Cie. AG (Zürich)

• No model number, 4-function, %, square root, pi, green VFD, 2-AA rep. batt.

Karstadt (German company)

• MR40, listed in book.
• FR20, 4-function, %, square root, pi, green VFD.
• SC85, scientific, VFD, Japan.

Kel-Co (Cannella Corp, Syracuse, NY, U.S.A)

• Class Computer, 4-function, horse-racing form functions, red LED, Singapore.

Keltmace

• 8D, 4-function, red LED, 5-AA rep batt, 82x145x36mm / 3.2x5.7x1.4", Hong Kong, instruction booklet has Keltmace 8D on outside but says it is ERL 812 inside. Photo.

Kessel (Kessel Electronics (HK) Ltd., of Hong Kong, is a company of the Kessel Group)

• 886D, Commodore (CBM) 886D with the Kessel label. Photo.
• MP3, 4-function, %, memory, red LED.
• WP3, 4-function, %, sq rt, sgn chg, red LED, 4-AAA rep batt, white color, 2.25x4.5". Photo.
• MEMORY, 4-function, %, memory, 9v PP3 rep. batt., Hong Kong, a 'Standard type 1' calculator.

KENNEX

• 802, 4-function, %, red LED, 4-AA rep. batt., Hong Kong, simialr to Abatron 802.

Keon ("London, Hong Kong, Melbourne")

• KE-003, 4-function, red LED, has very large keys
• KE-003A, 4-function, red LED, 4- AA rep batt, 76x161x22mm / 3.1x6.6x0.9", has very large keys and no On/Off switch - press "C" to power on, then powers off automatically if no button pressed for some time, Hong Kong. Photo, photo 2 .  There is a short article about this calculator on this site.

Keystone (U.S. company - see also Berkey)

• 88, listed in book. Featured calculator.
• 98, listed in book.
• 108, listed in book. Photo.
• 350, listed in book. Photo. Featured calculator.
• 370, listed in book.
• 390, listed in book. Photo, inside.
• 395 aka exponent 1, listed in book.
• 2010, listed in book. Photo.
• 2030, listed in book.
• 2030F, 4 function, %, square root, blue VFD, sealed rech. batt., U.S.A.  Feb. 22.
• 2040, listed in book.
• 2050, listed in book. Photo.
• SC 650, listed in book.
• SC 652, listed in book.
• SC 654, listed in book.
• SC 656, listed in book.

Kiankho

• Kiankho 006, 4-funct, %, memory, sq rt., VFD. Photo.

King Sonic

• 323, 4-function, %, memory, red LED, PP3 rep. batt., 76x137x25mm / 3.0x5.4x1.0". Photo.
• King Sonic aka 3000, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a "Standard Type 1 Calculator". Featured calculator.
• 5000, 4-function, %, memory, red LED, 9v PP3 rep. batt., a "Standard Type 2 Calculator".

Kings Point

• 8410 "Micro Universal", 4-function, separate green fluorescent tubes, 4-AA rep batt, 8.3x6.0", Japan, ~1972, switchable fixed decimal point or floating point, "battery low" LED indicator. Photo, inside.
• 8412 "Micro Memory", listed in book. Photo.
• 8413 "Micro Algebra", listed in book.
• 8414 "Micro Executive", listed in book. Photo.
• 9104, 4-function, %, green VFD, 4-C rep. batt., Japan.
• 9202, listed in book.
• FN-85 "Financial Computer", listed in book. Photo.
• KP-9, 4-function, %, memory, red LED, 9v PP3 rep batt, Korea.
• KP-200, listed in book.
• KP-450, listed in book.
• KP-460, function, %, square root, square, reciprocal, VFD.
• PC-2, listed in book.
• PC-50 "CONVERSION MASTER", 4-functions, metric conversion, red LED, 9v batt., Hong Kong.
• SC-10 (aka "Scientific 10"), scientific, red LED, 9v batt, Korea. Photo.
• SC-11, listed in book. Photo.
• SC-20, listed in book.
• SC-33, listed in book.
• SC-40, listed in book. Photo.
• SC-44, listed in book. Photo.
• SC-44F, listed in book. Photo.
• SC-60, listed in book.
• SC-6010, listed in book.
• SCM-100, listed in book.
• SPM-200, 4-function, %, memory, blue VFD, 3-AA rep. batt., Hong Kong.

Kingstron ("Kingstron Electric Co. Ltd., Taiwan, China")

• KH112, 4-functions, square root, blue VFD, 2-AA rep. batt., Taiwan.

Kitlex

• MICRO 6, 4 function, memory, 6 digits red LED, 9v rep batt, 3.0x6.0", Japan, wrist-strap. Photo.

KOKUYO

• KC-30A WISEMAN, 4 function, 3-digit green VFD, horizontal design same as Sharp EL-120 but more rounded white casing.

königer

• 9822, 4 function, %, square, reciprocal, memory, red LED.  Feb. 22.

Kores (International office supply company based in Vienna, Austria)

• B8, 4 function, %, square root, blue VFD, 2-AA rep. batt., Japan, similar to Canon Palmtronic 8. Photo.
• B8M, 4 function, %, memory, square root, blue VFD. Photo .
• Novus 821, 4 function, red LED, PP3 rep batt, 2.75x5.0", Singapore. Photo.
• Super 8M, 4 function, %, memory, sq rt., blue VFD, 2- AA rep batt, 75x142x21mm / 3.0x5.6x0.8", Taiwan. Photo .

Kosmos

• Astro, listed in book. Featured calculator.
• Kosmos 1, listed in book. Featured calculator.
• Kosmos 2, listed in book.

KOVAC (KOVAC CORPORATION, Osaka, Japan, marketed in Europe)#

• 809ESR, scientific, VFD, 4-AA rep batt, 85x174x27mm / 3.3x8.8x1.1", slide-on cover goes over keys. Photo , with cover, inside.
• 810F, financial functions, 4-function, %, square root, blue VFD, 4-AA rep. batt., Japan.
• 811ESR, scientific, 8-digits mantissa & 2-digits exponent green VFD, 3-AA rep batt., Japan.
• 858M, 4-function, %, square root, green VFD.
• 878M, 4-function, %, memory, blue VFD, 4-AA rep. batt., snap-on cover goes over keys, Japan.
• 888M, 4-function, %, memory, amber display.
• 888MR, 4-function, %, memory, red LED, snap-on cover goes over keys.
• 1220M, 4-function, %, memory, 12-digit red LED, 4-AA rep. batt., snap-on cover goes over keys, Japan.
• F-8PR, 4-function, %, sq. rt., green VFD, 2-AA rep. batt., 145x75x22mm / 5.7x3.0x0.9", Japan. Photo .
• K11M, 4-function, %, square root, memory, blue VFD, 4-C rep. batt., Japan.  Jan. 23.
• K-80, 4-function, amber gas-discharge, battery-level meter.
• K-80D, 4-function, %, amber gas-discharge, 4- C rep. batt., battery-level meter, Japan.
• K-81M, 4-function, memory, 4- C rep. batt., Japan.
• K-82DP, 4-function, %, green VFD, 4- C rep. batt., 4.75x8.4", Japan. ~1973. Photo.
• LE-802, 4-funct, red, LED, 6-AA rep. batt., 76x140x34mm / 3.0x5.5x1.3", Japan, c1973, has unusually large LED display . Photo, inside.
• LE-802PT, 4-funct, 'D' (refresh display key), red, LED, 4-AA rep. batt, Japan.
• Mini, listed in book.
• Pocket mini P-80, 4-function, sq rt., green VFD. Photo.
• Pocket Memory P-81, 4-function, %, square root, change sign, memory, green VFD, 2-AA rep. batt., 3.0x5.25" (7.6x13.6 cm), Japan. Photo.
• Pocket Memory P-81B, 4-function, %, square root, change sign, memory, green VFD, 2-AA rep. batt., Japan, looks similar to the P-81.
• Pocket P-82 "SCIENTIFIC FRIEND" scientific, VFD. Photo.
• SM-818M, 4-func, %, mem, 8-digits green VFD, 4x AA rech. batt., 92x158x28mm / 3.5x6x1", Japan. Photo , inside.
• SM-858M, listed in book.
• SM-1210M, 4-function, %, memory, 12-digits red LED, 4-AA rech. batt., Japan.  Jan. 23.
• SR-801, scientific, green VFD.

 

L

Labora Mannheim (German laboratory equipment company)

• SI-computer, alpha-numeric keyboard, for converting analytical laboratory units into S.I. (metric) units, green VFD. Photo 1, photo 2.

LANCIA

• ET-407, 4-function, red LED.
• FULL MEMORY SYSTEM, 4-function, %, memory, red LED, 9v PP3 rep. batt.

Lecom (The name might refer to the London Electricity Company, please get in touch with us if you any have information)

• 12, 4 function, 6 digits red LED, fixed decimal point (switchable 0 or 2 decimal places), 4-AA rep batt, 95x153x36mm / 3.7x6.0x1.4", Klixon keyboard (2nd issue), about 1973, integrated circuit in some versions is Cal-Tex Semiconductor Inc. CT5002, Taiwan, calculator similar to Prinztronic C20. Photo, inside.

Lexicon

• LK_3000, listed in book.

Litronix (U.S. company)

• 1000 aka Triton 1000, listed in book. Photo .
• 1002 (aka Checkmate), listed in book. Photo. Featured calculator.
• Checkmate 2nd version, listed in book. Photo. Featured calculator.
• 1100, listed in book. Photo.
• 1100A, listed in book.
• 1100R 4-funct, 8 digit red LED, decimal slide switch, uncommon (for this Litronix series) sealed batt, 3.0x6.0", same case as 1100 and Litronix 1000, brown color, Malaysia.
• 1101, listed in book. Photo.
• 1101P, listed in book.
• 1102, listed in book.
• 1102A, listed in book.
• 1502 aka Avatar, listed in book.
• 1600, 4-function, %, red LED, 9v PP3 rep. batt., Malaysia.  Jan. 23.
• 1602 aka memory, listed in book. Photo .
• 1603 aka slide rule, listed in book.
• 1700 aka Checkmate 1700, listed in book.
• 1710 aka Checkmate 1710, 4-function, %, red LED, 3-AA rep. batt., Malaysia.
• 1720 aka Checkmate 1720, listed in book. Photo .
• 1720A aka Checkmate 1720A, listed in book.
• 1740A aka Checkmate 1740, listed in book.
• 2120, listed in book.
• 2140, listed in book.
• 2200 aka memory plus, listed in book. Photo .
• 2200R, listed in book.
• 2220 aka memory, listed in book.
• 2200R aka memory, listed in book. Photo , rear.
• 2230 aka memory, listed in book. Photo .
• 2230R, listed in book.
• 2230/2235, listed in book.
• 2235, listed in book. Photo.
• 2240RA aka scientific, listed in book.
• 2250 aka slide rule, listed in book. Photo .
• 2250R aka slide rule, listed in book.
• 2260, listed in book.  Photo, rear.
• 2260R aka slide rule, listed in book.
• 2270 aka statistical, listed in book.
• 2270R aka statistical, listed in book.
• 2280 aka Memory II, listed in book.
• 2290 aka programmable, listed in book. Photo .

Litton (Litton Industries, U.S. company. By 1970 it also owned Monroe, Imperial, Royal, Triumph-Adler.)

• Micro Recorder-Calculator, 4-functions, %, memory, sq rt., yellow LCD, combined with micro-cassette recorder.

LJG

• 880, 4-functions, %, memory, red LED, version of the "standard type 2".

Lloyd (Deutscher Lloyd Lebensversicherung AG. German life insurance company)

• Lloyd, life insurance functions, red LED, based on the Texas Instruments TI-58.

Lloyd's and Lloytron (U.S. company, calculators with the Lloytron name are found in Europe. See the Calculator Companies section for more information. Model numbers may be preceded by 'Accumatic' or 'E' ).

• 20 aka EH-8822, listed in book. Photo.
• 30 aka EH-9036, listed in book.
• 30 aka EH-9036-2, listed in book. Photo.
• 30 aka EH-9036-0018, listed in book.
• 40, listed in book. Photo.
• 50 aka EH-9325, listed in book.
• 55 aka EH-8715, listed in book.
• 100, listed in book. Featured calculator.
• 200 aka E681, listed in book. Photo.
• 303, listed in book.
• 304, listed in book. Photo.
• 305, listed in book.
• 306, listed in book. Photo.
• 309 4-funct, mem, %, sq rt, pi, fluor, 2-AA rep batt, 3.0x5.0", Taiwan.
• 310, listed in book. Photo.
• 311, listed in book.
• 320, listed in book. Photo.
• 321, listed in book. Photo.
• 322, listed in book. Photo.
• 333, listed in book. Photo.
• 334, listed in book.
• 335, scientific, blue VFD.
• 340, listed in book. Photo.
• 341, listed in book. Photo.
• 406 "Monteverdi", 4-functions, %, blue VFD, 4-AA rep batt.
• 408, listed in book.
• 419, listed in book.
• 427 4-funct, mem, %, sq funct, pi, recip, 8 digit fluor, 4-AA rep batt, 3.5x5.5".
• 445, listed in book.
• 500, listed in book. Photo.
• 501, listed in book.
• 502, listed in book.
• 503, 4-function, %, memory, red LED.
• 511 4-funct, mem, %, 8 digit red LED, 9V rep batt, 2.75x5.25", same case as Standard Type 1 with slightly different functions, Hong Kong.
• 603, listed in book.
• 604, listed in book.
• 609, 4-functions, %, memory, sq rt., yellow LCD, 2-button cells, thin metal case.
• 610, listed in book.
• 616, listed in book.
• 650, listed in book. Photo.
• 680, 4-function, %, memory, 10-digits blue VFD, 2-D rep. batt., Taiwan, desktop size calculator.
• 907, listed in book.
• 908, 4-functions, memory, sq rt., blue V.F.D. Photo.
• 999, listed in book. Photo.

LMI ("THE WEIGL COMPANY INC., New York. N.Y.")

• Executive, 4-function, amber gas-discharge display, 2- rep. batt., rear label says "EXECUCAL model M55" "MADE IN USA BY METRONIC LABORATORIES INC., WAPINGERS FALLS, N.Y."

Logic

• MD101, 4-function, %, memory, sq. rt., blue VFD, 2-AA rep. batt. Photo.

Logitech (Logitech Inc., Taipai, Taiwan)#

• Logitech 1, listed in book. Photo.
• Logitech LC-16D, 4-function, %, memory, sq. rt., square, reciprocal, 12-digits green VFD, 4-AA rep. batt., 85x150x28mm / 3.3x5.9x1.1".
• Logitech LC-20F, scientific, memory, green VFD, 2-AA rep. batt.
• Logitech LC-20M "mini", 4-function, %, memory, sq. rt., green VFD, 2-AA rep. batt., 62x109x23mm / 2.4x4.3x0.9". Photo.
• Logitech LC-21F, 4-function, %, memory, sq. rt., change sign, green VFD, 2-AA rep. batt., 142x74x21mm / 5.6x2.9x0.8". Photo.
• Logitech LC-60D, scientific, scientific display with 8-digit mantissa & 2-digit exponent green VFD, 4-AA rep. batt., 85x150x28mm / 3.3x5.9x1.1".
• Logitech LC-80M "Super mini", scientific, green VFD, 2-AA rep. batt., 62x107x20mm / 2.4x4.2x0.8".
• Logitech LC-827R, 4-function, %, square root, memory, 4-AA rep. batt.
• Logitech LC-838R, 4-function, %, square root, memory, green VFD, 4-AA rep. batt., Taiwan.
• Logitech LC-839R, 4-function, %, square root, memory, green VFD, 4-AA rep. batt.

Lolek - see Elwro

Longines Symphonette

• LTP 5405, listed in book.
• "BATTERY-AC ELECTRONIC CALCULATOR", listed in book. Photo, Photo white number keys version.
• Electronic Calculator, listed in book, early version of Texas Instruments TI-2500, with 'CE/D' key. Photo.
• Electronic Calculator, later version of Texas Instruments TI-2500, with 'CE' key.

Lyceum

• LS-2144, 4-function, %, square root, red LED.

 

M

Mach

• Mach 888 aka SLIDE RULETTE, 4-function, %, red LED.
• Mach I aka Sliderulette, listed in book.
• Mach II aka Mini Calculator, listed in book, 6-digits VFD in separate tubes, does not have a decimal point key. Photo.
• Mach V, 4-function, %, memory, Japan.
• Mach VI aka SLIDE RULETTE, 4-function, %, memory, green VFD, 4-AA rep. batt.

MADISON ("MADISON by CARAN D'ACHE")

• 802D, 4-function, %, square root, blue VFD, 2-AA rep. batt.  Jan. 23.

Magiclick (Distributed in Spain by eye S.A.)

• 005, 4-function, red LED, 4-AA rep. batt., Mexico, looks similar to General Instrument EZ-3000.
• 306 PERSONAL, 4-function.
• 350, 4-function, %, sq. rt., memory, red LED, 9v PP3 rep. batt., 125x70x22mm /  4.9x2.75x0.9", Spain, c1975, has multiple memory with three independent registers. Photo.
• 450, 4-function, %, sq. rt., square, reciprocal, memory, red LED, 4-AA rep. batt., Argentina.
• 455, 4-function, %, sq. rt., square, pi, red LED.
• 470 financiera, financial functions, red LED, 4-AA rep. batt., Argentina.

Magnon

• MG-8R, 4-function, %, sq. rt., green VFD, 4-AA rep. batt., Japan.
• MINI-8M II aka LE-8-7M II, 4-function, %, sq. rt., memory, red LED, 9v PP3 rep. batt., Japan.

Mallory

• Mallory, scientific, 8-digits mantissa & 2-digits exponent red LED, "Made in Germany by Interton Electronic".

Manica

• 8, listed in book. Photo.

Mannics (Mannics Industries Corporation, Taipei, Taiwan)#

• 303, listed in book. Photo.
• 307, scientific, green VFD.
• MK-806, 4-function, %, red LED. Photo.
• MK-818, 4-function, %, square root, memory, blue VFD, 4-AA rep. batt., Taiwan.  Feb. 22.

Mariner (NRC, New York)

• NRC-720, 4-function, red LED, rech batt, Klixon keypad.
• NRC-7200, 4-function, red LED, rech batt, Klixon keypad, circuit board marked MELCOR.

Maruman

• Cigarette-lighter/calculator, 4-func, %, mem, sq rt, 8 digits yellow LCD, 67x35x12mm / 2.6x1.4x0.5", Malaysia. Photo 1, photo 2.

Master Calculator Company (U.S. company)

• Mini Master, listed in book. Photo.

MATAC

• MATAC, 4-functions, red LED, 4-AA rep. batt., 75x155x19mm / 3.0x6.1x0.75", c1973, Japan. Photo, inside.

Mathbook

• 806L, listed in book.
• 817L, listed in book. Photo.

Math Master (Epoch Co. Ltd.)

• Math Master, math teaching/game "calculator", green VFD, 2-AA rep. batt., 86x150x24mm / 3.4x5.9x0.9", 1977, Japan. Photo.

Mathmatic (American Circuitron Inc., Hamden, Conecticut,  U.S.A., also Mathmatic Sales Inc., Waterbury, CT.)

• 777, 4-functions, %, memory, red LED, 9v batt.
• 879, 4-functions, %, sq rt, red LED,  9v batt.
• 808, 4-functions, red LED,  sealed rech. batt., U.S.A.
• 888, 4-functions, %, memory, red LED,  3-C rech. batt., U.S.A., c1975. Photo.
• 889, 4-functions, %, square root, square, reciprocal, memory, red LED, sealed rech. batt., U.S.A.
• S-666, listed in book. Photo.
• S-888, listed in book.
• S-999, 4-functions, %, memory, red LED, 9v PPS rep. batt., Thailand.

Mattel (U.S. company)

• JR Ewing, listed in book.

Mayfair (Mayfair Sound Products Inc., Chicago, Illinois, U.S.A.)

• 2W01B, listed in book. Photo.
• XL-333 "RAGGEDY ANN AND ANDY" "SOLID STATE CHILDRENS ELECTRONIC MATH BOARD", 4-function, 6-digit green VFD, 9v PP3 rep. batt., Japan, horizontal form with number keys in a line.
• XL-1000, 4-function, 6-digit green VFD, 9v PP3 rep. batt., Japan, horizontal form with number keys in a line, "Numerical Sequence Keyboard".

Mayhugh

• 8M, 4 function, %, memory, red LED, 9v PP3 rep. batt., 69x135x24mm \ 2.7x5.3x0.9". Photo.

MBO (MBO Schmidt & Niederleitner gmbh & Co. KG, Germany)

• 80DX, 4-function, %, memory, blue VFD, 4-AA rep. batt.
• 570 (aka "Handy"), listed in book. Photo.
• 801MR, 4-function, %, square root, memory, green VFD.
• 838MD, listed in book. Photo.
• 3000, 4 function, %, memory, red LED, 9v PP3 rep. batt., a 'Standard type 1' calculator.
• 3010, 4 function, %, memory, red LED, 9v PP3 rep. batt., a 'Standard type 1' calculator.
• 3050, 4 function, %, memory, sq, green VFD, 2-AA rep batt, 3.0x5.5". Photo.
• 4512, scientific, green VFD, horixontal design.
• ACCORD I, 4-function, %, square root, pi, memory, green VFD, 2-AA rep. batt.
• ACCORD II, 4-function, %, square root, square, reciprocal, pi, memory, green VFD.
• ACCORD III, 4-function, %, square root, x^N, reciprocal, pi, memory, green VFD, 2-AA rep. batt., Japan.
• alpha II, scientific, red LED.
• alpha 10, scientific, blue VFD, 3 rep. batt.
• alpha 51, scientific, green VFD.
• alpha 1000-1, scientific, green VFD, 2-AA rep. batt., 86x161x25mm / 3.4x6.3x1.0", Japan. Photo .
• alpha 2000, scientific, green VFD.
• alpha 3000, scientific, green VFD.
• Classic I, 4 function, %, square root, blue VFD, 2-AA rep. batt.
• Classic II, 4 function, %, square root, pi, memory, green VFD.
• Classic III, 4 function, %, sq rt, memory, VFD. Photo.
• COMET, 4 function, red LED.
• Concorde I, 4 function, %, sq rt., green VFD, 2-AA rep. batt.
• Concorde II, 4 function, %, sq rt., pi, VFD.
• Concorde III, 4 function, %, sq rt., pi, green VFD.
• Conti 10, 4 function, %,sq rt.,  memory, green VFD.
• Conti 20, 4 function, %, sq rt., memory, green VFD.
• de Luxe I, 4 function, %,  8 digits, green VFD, 2-AA rech. batt., 78x137x25mm / 3.1x5.4x1.0", c1975. Photo .
• de Luxe II, 4 function, sq rt., pi, memory, green VFD, 2-AA rep. batt.
• de Luxe III, 4 function, sq rt., memory, blue VFD, 2-AA rep. batt. Photo.
• de Luxe V, scientific, 8 digits mantissa & 2 digits exponent green VFD, 2-AA rep. batt.  Feb. 22.
• DELTA 20, 4-function, %, square root, memory, blue VFD.
• DELTA 30, 4-function, %, square root, square, reciprocal, memory, VFD.
• DELTA 40, scientific, VFD. Photo.
• Derby, 4-function, red LED, Hong Kong, 9v PP3 rep. batt., similar to Sands 004.
• Derby 1, 4-function, %, VFD, 1-AA rep. batt., 2.75x4.3", c1975.
• Derby II, 4-function, %, square root, VFD, 1-AA rep. batt., Singapore.
• EXAKT 10, 4-function, %, square root, square, reciprocal, pi, green VFD, 1-AA rep. batt.
• EXAKT 40, scientific, VFD, 2-AA rep. batt.
• FN-8D, financial functions, blue VFD.
• Junior, 4-function, red LED, 5-AA rep. batt., Germany.
• K-80W, 4-function, amber gas-discharge tubes, 4-C rep. batt., battery-level meter.
• M-801, 4-function, VFD tubes, Japan.
• Manager, 4-function, %, square root, blue VFD, 4-AA rep. batt.  Jan. 23.
• MICRO 855D, 4-function, %, red LED.
• MINI HANDY 80D, 4-function, %, red LED.
• mini handy 80M, 4-function, %, memory, red LED.
• MONARCH CX 40, scientific, green VFD.
• SC-10, scientific, green VFD, 3-AA rep. batt.
• SC 30, scientific, green VFD, 3-AA rep. batt.
• SC-40, scientific, red LED.
• Sigma 2, 4-function, %, square root, memory, red LED.
• Sigma 20, scientific, blue VFD, 9v PP3 rep. batt.
• TR-80M type 1, 4-function, %, memory, VFD, 4-C rep. batt., Japan.
• TR-80M type 2, 4-function, %, square root, memory, blue VFD, 4-C rep. batt., Germany.

MD1 and MD2 (found in Europe.)

• MD1 888p, 4 function, %, red LED, 9v PP3 rep. batt., 68x113x25mm / 2.7x4.5x1.0", chip IEE RC5000 (1975), Singapore. Photo.
• MD2 888m, 4 function, %, mem, red LED, 68x113x25mm / 2.7x4.5x1.0", chip IEE RC50 (1976), Singapore. Photo, inside.

McO

• McO-515, scientific, red LED.

MEC (Metropolitan International Enterprises Co. Ltd)

• MEC, 4-function, %, sq. rt., green VFD, 2-AA rep. batt., 118x79x21mm. Photo.

Megatone (Iwatani & Co. Ltd., Japan)

• 60, 4 function, 6 digits green VFD, 4-AA rep. batt., 104x157x40mm / 4.1x6.2x1.6", Japan, c1973, similar to Adler EC60. Photo 1, photo 2.

Meir

• 880. Featured calculator.

Melcor (Melcor Electronics Corp., Farmingdale, N.Y., U.S.A.)

• 40 aka Maximus 40, listed in book.
• 50 aka Maximus 40, listed in book.
• 190, 4-function, %, memory, red LED, 9V rep batt, U.S.A., also available as a self-assembly kit.
• 360 aka 360B, 4-function, red LED.
• 370, 4-function, red LED, 9V rep batt, 79x153x24mm / 3.1x6.0x0.9", U.S.A., has membrane keypad.  Photo , photo inside.
• 380, type 1, listed in book, standard keypad. Photo, photo inside.
• 380, type 2, 4-function, %, memory, membrane keypad. Photo.  Dec. 22.
• 390, listed in book.
• 392, listed in book.
• 400, listed in book. Photo.
• 480, listed in book.
• 500, listed in book.
• 550, listed in book.
• 590, listed in book. Photo.
• 655, listed in book.
• 670, listed in book.
• 747, listed in book.
• 888, 4-function, red LED, 9V rep batt.
• 1000 4-funct, 8 digit red LED, 9V rep batt, 3.2x6.0", similar case to 400 with different shaped keys, blue color, USA.
• Compu-tech X, listed in book.
• MARINER aka NRC 720, 4-function, red LED, 6-AA rechargeable batt., U.S.A.
• SC-535, listed in book.
• SC-615, scientific, 8-digits mantissa & 2-digits exponent red LED, sealed rechargeable batteries, U.S.A.
• SC-635, listed in book. Photo.
• SC-645, scientific, red LED, U.S.A.
• SC-655, scientific, red LED. Photo.
• SR8 "ANSWERMATH", 4-function, %, memory, sq rt, red LED.

Memory Devices (East Molesey, Surrey, England.)

• Memory 808MD, 4-function, %, memory, square root, green VFD in a single tube, 4-N rech batt., 77x138x20mm / 3.0x5.4x0.8". Featured on British calculator site.
• Memory ESR-817, Scientific, green VFD in a single tube, 4-N rech batt., 83x143x21mm / 3.25x5.7x0.8", 1974. Featured on British calculator site.
• MEMORY S-874LR, Scientific, red LED, 3-AA rechargeable batteries.

Memory Master (European market calculator)

• Memory Master, 4 function, %, memory, red LED, 3-AA rep batt, 75x153x20mm / 3.0x6.0x0.8". Photo .
• Memory Master II, 4 function, %, memory, red LED, 9v PP3 rep. batt., 73x133x25mm / 2.99x5.2x1.0".  Photo, inside.
• Memory Master M, 4 function, %, memory, square root, square, reciprocal, red LED, 3-AA rep batt, 3.1x6.2", Hong Kong, ~1975. Photo.
• Memory Master X, 4-funct, mem, %, sq funct, recip, paren, red LED, 3-AA rep batt, 3.0x6.0", Hong Kong. Photo.

Methodo

• 807 MD, 4 function, %, memory, square root, square, reciprocal, VFD, Korea. Photo.
• 832MD, 4 function, %, memory, square root, VFD, 1-AA rep. batt.

Metro

• 8-2, 4-function, red LED, boxy horizontal design.

Metronic Laboratories (U.S. company)

• Execucal M55, listed in book.

Microcifra (fate Electronica, Argentinian company)

• 3, 4-function, red LED, 6- AA rep. batt., 66x152x25mm / 2.6x6.0x1.0", Argentina, batteries are in a bulge at the back. Photo, photo of rear.
• 4, 4-function, %, memory, red LED, 6- AA rep. batt., Argentina.
• 10 cientifica, scientific, red LED.

Microlith

• 111, 4-function, %, red LED, 9v PP3 rep. batt., Hong Kong.
• 113G "MEMEORY 4", 4-function, %, memory, sq rt., red LED, 9v PP3 batt, Hong Kong.
• 205 "Scientific", listed in book. Photo.
• Memory, 4-function, %, memory, red LED.

MICROLUX (MICROLUX by WINDERT)

• Calculator Watch, 4-function, time, date, red LED, 4-button cells, similar to Compuchron calculator watch.

MICROMA

• Calculator Watch, 4-function, time, date, red LED, 4-button cells, similar to Compuchron calculator watch.

Miida (One calculator labelled "Marubeni Corporation, In U.S.A. Miida Electronics, Inc., In Canada Master craft Enterprises")

• 8, listed in book. Photo.
• 606, listed in book. Photo.
• 808, listed in book.
• 809, listed in book.
• 828, listed in book.
• 838, listed in book.
• 988, listed in book.
• MC855M, listed in book.
• MC868M, listed in book.
• MC918, 4-function, %, green VFD, 2-AA rep. batt., Japan. Photo.

MIKE

• 3030, scientific, red LED, 4-AA rep. batt.  Feb. 22.

MILUX

• No model number, 4-functions, green VFD.

Minerva (U.S. company)

• 825, listed in book. Photo.

Minicom

• Executive 8, 4-function, %, red LED, Ni-cad rech. batt. pack, 68x121x18mm / 2.7x4.75x0.7", Singapore. Photo, photo with batt. pack.
• M-818, 4-function, red LED.

Minipet

• V-1, 4-functions, memory, blue VFD separate tubes, 4-C rep. batt., 137x160x67mm/ 5.4x6.3x2.6", U.S.A, uses Western Digital ER1422B & ER1432B ics. date coded 1973 in the illustrated example. Photo, inside.
• V-2, 4-functions, %, memory, VFD, 4-AA rep. batt., U.S.A.

MINITEC (TOYO ENTERPRISE CO., LTD., JAPAN)

• TE-8M, 4-functions, Japan.

Minitron (made in Yugoslavia (now Serbia) by Elektronska industrija-Niš.  Designs developed from Rockwell/ANITA after end of production in Britain.)

• 811, 4-functions, %, memory, red LED, 3-AA rep batt, 69x118x24mm (2.8x4.7x1"), Yugoslavia, similar to ANITA 811. Photo.
• 811B, 4-functions, %, memory, green VFD, 3-AA rep batt, 69x118x24mm (2.8x4.7x1"), Yugoslavia, similar to ANITA 811 except for the green VFD. Photo.
• 821B, 4-functions, %, memory, sq rt, blue VFD, 3-AA rep. batt., Yugoslavia.
• 831, 4-functions, %, memory, sq rt, square, reciprocal, red LED, 3-AA rep. batt., Yugoslavia, enhanced version of ANITA 831.
• 831B, 4-functions, %, memory, sq rt, square, reciprocal, green VFD, 3-AA rep batt, 69x118x24mm (2.8x4.7x1"), Yugoslavia, enhanced version of ANITA 831 with green VFD replacing red LED. Photo.
• 841 (version 1), Scientific, red LED, 3-AA rep batt, 69x118x24mm (2.8x4.7x 1"), Yugoslavia, similar to ANITA 841. Photo.
• 841 (version 2), Scientific, green VFD, 3-AA rep batt, 69x118x24mm (2.8x4.7x 1"), Yugoslavia, similar to ANITA 841 except for the green VFD. Photo.
• 841B, Scientific, green VFD, 3-AA rep. batt., Yugoslavia, similar to ANITA 841.
• 841C, Scientific, green VFD, 3-AA rep. batt., Yugoslavia.
• 851B, 4-functions, metric conversion, green VFD, 3-AA rep. batt., Yugoslavia.
• 861, Financial, red LED, 3-AA rep batt, Yugoslavia, similar to ANITA 861.
• 871S, 4-function, %, square root, memory, green VFD, 2-AA rep batt, Yugoslavia.
• 881S, Scientific, green VFD, 2-AA rep batt, Yugoslavia.
• 1012SR, Scientific, green VFD, 2-AA rep batt, Yugoslavia, similarities to Rockwell 63R.

Minolta (Japanese camera company)

• Minolcom, 4-funct, 8-digits "Nixie" type tubes, 4.8v rech batt pack, 108x182x51mm / 4.15x7.2x2", Japan, 1971. Photo, inside. Featured calculator .

Mintron (Minsung Electronics Ltd., Seoul, Korea)

• 802DG, 4-function, %, sq rt, green VFD, 135x80mm / 5.3x3.2", 2-AA rep batt, Korea. Photo .
• 810ND, 4-function, %, green VFD. Photo, inside.
• 812D, listed in book.
• 822DR, listed in book.
• 830D, 4-function, %, green VFD, 3-AA rep. batt., Korea.
• 832D, 4-function, %.
• 836D, 4-function, %, square root, pi, memory, blue VFD, 2-AA rep. batt., Korea.
• 845D, listed in book.
• ESR-817 "Electronic Slide Rule", scientific, red LED, 4-AA rechargeable batteries, Korea.
• ESR-817D "electronic slide rule", scientific, green VFD, 2-AA rep. batt., Korea.
• M1205D, listed in book.
• S812D, listed in book.

Miracal (P D Labs, 2120 Ronald St., Santa Clara, California, U.S.A.)

• Miracal (no model number), 4-function, red LED, 78x137x37mm / 3.1x5.4x1.5", 4-AA rech. batt., U.S.A., 1973. This calculator features in the "One Hit Wonders" article.

Miracle

• II, 4-function, red LED, direct AC rechargeable battery, Hong Kong, similar to the Monte Carlo models.

MITS (Micro Instruments & Telemetry Systems.  U.S. company, famous for being one of the first companies to make home computers.)

• 150, listed in book. Photo. Featured calculator.
• 605M, listed in book.
• 905M, listed in book.
• 908M, listed in book. Photo. Featured calculator.
• 941M, listed in book. Photo. Featured calculator.
• 1206, listed in book. Photo.
• 1209, listed in book.
• 1212, listed in book. Photo. Featured calculator.

M-OFFICE (A trade name of the Migros supermarket and department store company of Switzerland.)

• 18S, 4-function, %, 8 digits (7 digits if -ve. !) red LED, 9v rep. batt., 180x64x24mm / 7.1x2.5x0.9". Photo .
• 28SR, 4-function, %, square root,  green VFD, 2- AA rep. batt., 130x73x24mm / 5.1x2.9x0.9". Photo .
• 60SR, scientific, VFD. Photo.

Monarch (No details available. If you have information about this company please get in touch.)

• 800C, 4-function, blue VFD, 79x140x26mm / 3.1x5.5x1.0", 4-AA rep. batt., Taiwan. Photo.

Monroe-Litton (U.S. company)

• 10, listed in book. Photo.
• 20, listed in book. Photo.
• 30, listed in book. Photo.
• 40, 4-func., %, red LED, 4x AA rech batt. pack, 86x164x46mm / 3.4x6.5x1.8", U.S.A.,c1974. Photo .
• 98, listed in book. Photo.
• 99, listed in book.
• 324, listed in book.
• 326, listed in book.
• 360, listed in book.

Monte Carlo (Manufactured in Hong Kong, possibly by (or distributed by) Collins Industrial Co., Ltd.)

• Monte Carlo, listed in book. Featured calculator.

Monteverdi

• Monteverdi, listed in book. Photo.
• E-801, 4-function, %, green VFD.

Montgomery Ward

• Electronic I, listed in book.
• P8F, listed in book. Photo.
• P8P, listed in book.
• P10, listed in book.
• P50, listed in book.
• P60, listed in book.
• P90, listed in book.
• P100, listed in book. Photo.
• P130, listed in book.
• P200, listed in book. Photo.
• P201, listed in book.
• P202, listed in book. Photo.
• P300, listed in book.
• P330, listed in book.
• P800, listed in book. Photo.

Morse Electrophonic

• Cal-801, listed in book.

MORSE INTERNATIONAL INC.

• No model number, 4-function, red LED, sealed rechargeable batteries, Japan, "MANUFACTURED FOR ACCURATE CALCULATOR CORP., NEW YORK, N.Y.  DISTRIBUTOR: MORSE INTERNATIONAL INC."

M.P.Alas - See Ei

MPI

• 350, 4-functions, %, red LED, 9v PP3 rep. batt., Hong Kong.
• 360, listed in book.
• KD-350, 4-functions, %, red LED, 9v PP3 rep. batt., Hong Kong.

Mustang

• 3000, similar to Bohsei 3000. Photo.  See also the "Standard Type 1 Calculator" page. Featured calculator.

MVB

• 800D, 4-function, %, square root, memory, green VFD.
• C8, 4-function, %, pi, blue VFD, 2-AA rep. batt., Japan.

 

N

National (see Panasonic.  The brand name often used in the 1970s was National Panasonic)

National Cash Register (NCR) (U.S. company)

• 18-40, 4-function, 12-digits red LED, 4-AA rep. batt., Japan, rebadged Busicom LE-120S 'handy'.
• 18-44, listed in book. Featured calculator. Photo.

National Semiconductor and Novus (U.S. company, some calculators marked National Semiconductor and some marked Novus)

• 200, listed in book. Photo.
• 200R, listed in book. Photo.
• 201, listed in book.
• 202, listed in book.
• 203R, listed in book.
• 500, listed in book.
• 600, listed in book. Photo.
• 650 aka 'Mathbox', listed in book. Featured calculator .
• 750, listed in book. Photo.
• 810, 4-function, red LED, similar to Sheen 004.
• 820, 4-function, red LED, Singapore, 9v rep batt. Photo.
• 821, 4-function, %, red LED, 9v rep batt, U.S.A. Photo.
• 822 aka 'The Professional', listed in book.
• 822M, 4-function, memory, %, red LED, 9v rep batt. Photo.
• 823, listed in book. Photo.
• 824, 4-functions, %, memory, red LED, PP3 rep. batt. Photo .
• 824T, 4-functions, %, memory, red LED, PP3 rep. batt.  Feb. 22.
• 826, listed in book. Photo.
• 830 aka 'Datachecker', listed in book.
• 831, listed in book. Photo.
• 832, listed in book. Photo.
• 835, listed in book. Photo.
• 835A, listed in book. Photo.
• 842, listed in book. Photo.
• 850, listed in book.
• 850A, listed in book. Photo.
• 852, listed in book. Photo.
• 900, listed in book.
• 950, listed in book. Photo.
• 1000, 4-funct, 8 digit red LED, 9V rep batt, 3.2x6.0", similar case to 400 with different shaped keys, blue color, USA.
• 3500 aka 'Sliderule', listed in book. Photo .
• 4510 aka 'Mathematician', listed in book. Photo , inside, comparison of eight different versions of Novus 4510 "Mathematician" with labelling and colour variations.
• 4515 aka 'Mathematician PR', listed in book. Photo.
• 4520 aka 'Scientist', listed in book. Photo.
• 4525 aka 'Scientist PR', listed in book. Photo .  Associated article: "Replacing a defective Main Chip of a Novus 4525 Scientist PR".
• 4615, listed in book. Photo.
• 4640, listed in book. Photo.
• 4650, listed in book. Photo.
• 4660, listed in book. Photo.
• 6010 aka 'International Computer', 4 function, %, memory, metric conversion, red LED, PP3 rep batt, Hong Kong. Photo, circuit board.  Apparently this is the second version with electronics encapsulated in a 'blob' on the display circuit board rather than in standard integrated circuit packages.
• 6020 aka 'Financier', listed in book. Photo .
• 6025 aka 'Financier PR', listed in book. Photo .
• 6030 aka 'Statistician', listed in book. Photo .
• 6035 aka Statistician PR, statistics, programmable, red LED.
• Attache, listed in book.
• Billfold 91, 4-function, %, memory, square-root, red LED, 9v Duracell "Flat Pak" rep. batt., calculator alone 87x146x11mm / 3.4x5.75x0.4", c1976, U.S.A., calculator incorporated in a billfold (wallet) similar to the Executive. Featured calculator.
• CM IV, listed in book.
• Executive, listed in book. Photo.
• Quiz Kid, listed in book.
• Whiz Kid, listed in book.

Navtronic see Specialized Electronics Corp.

NCR see National Cash Register.

Neckermann (German department store)

• electronic 210, 4-function, memory, red LED, 5-AA rep. batt., West Germany.
• electronic dc6+6, 4-function, 6-digits red LED, 9v PP3 rep. batt.
• electronic dc8, 4-function, red LED, Klixon keyboard.

Nentone

• CAL-0041, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a 'Standard Type 2' calculator.

Nestler (German office equipment company)

• OH 1002A, 4-function, %, sq rt, memory, green VFD, 2-AA rep. batt., 79x123x22mm/3.1x4.8x0.9".  Photo.
• T52, 4-function, %, sq rt, memory, green VFD, 2-AA rep. batt.
• T53, 4-function, %, sq rt, green VFD, 2-AA rep. batt.,

Netronics (Netronics Research & Development Ltd., Spring Valley, N.Y., U.S.A.)

• 1000, listed in book. Photo.
• N1000X, scientific, red LED.
• N 2000/MX, scientific, 10-digits mantissa & 2-small size digits red LED, sealed rech. batt.

Neutron

• 110, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a 'Standard type-1' calculator.
• 110B, 4-function, %, memory, red LED, Hong Kong.
• 120, 4-function, %, memory, red LED, Hong Kong, a 'Standard type-2' calculator.
• 210-B, 4-function, %, sq rt., green VFD.
• G88M, 4-function, %, sq rt, memory.  Jan. 23.
• super 88M, 4-function, %, memory, red LED, 9v PP3 rep. batt., Singapore.  Feb. 22.

New Bright (Shinsho Sangyo Co., Ltd., Tokyo, Japan)

• Bright 8, 4-function, amber gas-discharge display, 4-AA rep. batt., 102x140x37mm / 4.0x5.5x1.5", Japan. Photo .

Nixdorf

• LK-3000, listed in book.

Nobility

• 309, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a 'Standard type-1' calculator.  Feb. 22.
• 3000, listed in book.
• K14/350, listed in book. Photo.
• U4/9990, 4-function, red LED.

NORIS

• 3000, 4-function, %, memory, red LED, 9v PP3 rep. batt., Hong Kong, a 'Standard type 1' calculator.

norman (AUTO RADIO NORMAN, Argentina)

• 600, 4-function, square root, square, reciprocal, red LED, similar to Melcor 400.
• 630, scientific, green VFD.
• 711, scientific, green VFD.
• novus Matemática 800, scientific, red LED, has similarities to National Semiconductor Novus 4510.

nova

• 805 D, 4-function, %, square root, VFD.

Novax

• 83DX, 4-function, %, square root, memory, blue VFD, 4-AA rep. batt., Japan.
• 8002M, 4-function, %, VFD, 4-AA rep. batt., Japan.
• TN-85, 4-function, %, green VFD.

Novus - see National Semiconductor.

Numerex

• 802, 4-funct, 8-digits red LED, PP3 rep batt, 86x157x34mm / 3.4x6.2x1.3". Photo 1, photo inside.

Nuvox

• N-8, 4-function, blue VFD, 4-AA rep. batt., Japan.

 

O

Office International (We have no information about this company - If you know anything please drop us a line.)

• 8002, 4-funct, %, blue VFD, 4-AA rep batt, 83x134x27mm / 3.3x5.3x1.1", Japan. Photo.
• 8002M, 4-funct, %, memory, blue VFD.
• HM, 4-function, %, memory, blue VFD.  Jan. 23.

Okhai (Scottish company)

• 8P. Featured on British calculator site.

Olivetti (Italian company)

• Divisumma-18, listed in book. Photo.
• Logos 3, 4 functions, %, printer only, 4-AA rechargeable batteries.
• Logos 7, 4 functions, %, memory, time and date calculations, 12-digits, green VFD & thermal printer, 4-AA, 296x168x43mm / 11.6x6.6x1.7", Japan. Photo.

Olympia (German company, subsidary of AEG-Telefunken.  Some early models made in Japan by Matsuhita, and so resemble Panasonic models.)

• 108MS, listed in book.
• 816MS, listed in book. Photo.
• CD-25, 4 function, %, green VFD, 2-AA rep. batt., Japan.  Jan. 23.
• CD-42, 4 function, %, memory, sq rt., VFD. Photo.
• CD-43, 4 function, %, green VFD.
• CD-44S, listed in book.
• CD-45, listed in book.
• CD-46, listed in book.
• CD-51, listed in book.
• CD-60, 4 functions, 6-digits green VFD, 4-AA rep batt, 92x113x19mm / 3.6x4.5x0.75", Japan, same as Panasonic 660. Photo.
• CD-70, 4 function, green VFD, 4-AA rep batt., 85x136x30mm / 3.3x5.4x1.2", c1973, Japan. Photo .
• CD-71, listed in book.
• CD-75, listed in book.
• CD-80, listed in book.
• CD-81, similar to Panasonic JE-855U. Featured calculator .
• CD-91, scientific, blue VFD, 3-AA rep. batt., Japan.  Jan. 23.
• CD-92, scientific, green VFD.
• CD-94, scientific, 8-digits mantissa & 2-digits exponent green VFD, 4-AA rep. batt.
• CD-100, listed in book. Photo.
• CD-101, 4-function, %, 10-digits green VFD, c1973. Photo, inside.
• CD-102, 4-function, %, 12-digits green VFD, 2-C rep batt, 172x195x55mm / 6.75x7.75x2.2", Japan, c1976. Photo .
• CD-202, 4-function, %, memory, 12-digits green VFD, 2-C rep batt, 172x195x55mm / 6.75x7.75x2.2", Japan, c1978. Photo.
• MEC-81 ELECTRONIC RULER, 4-functions, %, memory, square root, and length measurement via wheel, green VFD, 2-AA rep. batt., Japan, a rebadged Panasonic PJE-8210U.
• OF-10, 4-function, %, square root, green VFD, 3-AA rep. batt.

Omron (Omron Tateisi Electronics Co., Japan)

• 6, 4-function, 6-digits blue VFD, 2-AA rep. batt., Japan.
• 8 mini (aka 820), 4-function, %, sq rt, green VFD, 2-AA rep. batt. Japan.
• 8 (aka 840) type 1, 4-function, %, sq rt, green VFD, 2-AA rep batt, 76x130x22mm / 3.0x5.1x0.9", Japan. Photo .
• 8 (aka 88R) type 2, listed in book. Photo.
• 8M, listed in book.
• 8P, 4-function, %, sq rt., blue VFD, 2-AA rep. bat.
• 8PM, 4-function, %, sq rt., memory, VFD.
• 8SM, 4-function, %, memory, sq rt., blue VFD, 2-AA rep batt.
• 8SR, listed in book.
• 10SR, scientific, 8-digits mantissa & 2-digits exponent, green VFD.
• 12F, 4-function, financial functions, 12-digits blue VFD, 3-AA rep. batt., Japan.
• 12SR, listed in book.
• 60, 4-function, 6-digit blue VFD, 4-AA batt.
• 80N, 4-function, 6-digits green VFD, 4-AA rep. batt., 104x157x40mm / 4.1x6.2x1.6", similar to Megatone 60.
• 86, listed in book.
• 86M, listed in book. Photo.
• 86R, listed in book.
• 86SM, 4-function, %, memory, sq rt., blue VFD.
• 86SR, listed in book. Photo.
• 87, 4-func, %, sq rt, 8-digits green VFD, 2x AA rep batt, 82x134x21mm / 3.5x5.5x1". Photo.
• 88, listed in book.
• 88M, listed in book.
• 88R, listed in book.
• 8SR, listed in book.
• 89M, listed in book.
• 127M, 4-function, %, square root, memory, 12-digits blue VFD, 4-AA rep. batt., back slides up to replace batteries.
• 140SR aka 6005CP, scientific, 8-digits mantissa & 2-digits exponent blue VFD, 4-AA rep. batt., Japan.  Jan. 23.
• 151SR, scientific, 8-digits mantissa & 2-digits exponent blue VFD, 2-AA rep. batt., Japan.  Jan. 23.
• 606, listed in book.
• 821 mini, 4-function, %, blue VFD, Japan.
• 860, listed in book.
• 865R, listed in book.
• 8300, listed in book.

ONGNICA

• 3000, 4-function, %, memory, red LED, 9v PP3 rep. batt., a 'Standard type 1' calculator.

Ordibel Collators

• Executive, listed in book.

Orion (please let us know if you have any information about this company).

• Orion, 4-function, green VFD, Japan, unusual since the battery compartment is detachable and can be replaced with an AC module. Photo, photo with AC module removed.
• RISING - II, 4-function, %, square root, memory, green VFD, 2-AA rep. batt.

ORIS

• ORIS, 4-function, amber gas-discharge, 4-C rep. batt., Japan, battery-level meter, similar to TEAL K-80M.

 

 

Click to go to :
Calculator Book Addendum A-B
Calculator Book Addendum C-D
Calculator Book Addendum E-I
Calculator Book Addendum P-R
Calculator Book Addendum S
Calculator Book Addendum T-Z

 

Key to Abbreviations

Functions:
4-funct = 4 basic mathematical functions (addition, subtraction, multiplication, division)
sci-funct = scientific or engineering functions (logarithmic and trigonometric functions such as log, sine, and cosine and usually memory, square, pi, etc.)
mem = memory
% = percent function
exp = exponent
paren = parentheses
pi = pi value
recip = reciprocal
sgn chg = sign change
sq rt = square root
sq funct = square functions (including square and square root)

Battery Type:
button rep batt = very small, disk-shaped, replaceable batteries commonly termed button-types, used mainly in LCD models.
rep batt = replaceable batteries (such as 9V, AA, C, and N batteries)
rep batt pack = replaceable batteries in a removable pack
sealed batt = rechargeable batteries sealed in the case
sealed batt pack = rechargeable batteries in a removable pack

Display Type:
See the section on Calculator Displays for more detailed information.
Displays have 8 digits unless specified otherwise.

COS-LCD = Early Liquid Crystal Display from Sharp showing silver digits on a dark background. COS stands for Crystal on Substrate. This display was used as early as October 1973 but eventually was phased out.
fluor = see VFD.
Gas discharge = Display containing all digits sealed in a single package employing  gas discharge to generate light in the same way as a neon lamp. Normally give amber- or orange-colored digits, and typified by the Panaplex® used by a few calculator manufacturers.
LCD = Liquid Crystal Display, a flat, gray-digit type of display type that uses less power and was embraced by calculator makers by the end of the 1970s. Early versions (used in the early 1970s) by Rockwell and Sharp are included in this guide.
LED = Light Emitting Diode display (usually red although sometimes a purple filter was used to color the display). LEDs often have small half bubble-like covers over the digits. tube or mini-tube = separate vacuum or fluorescent tube for each digit of display.
Yellow LCD = Early LCDs had a reliability problem with ultra-violet light and manufacturers used a yellow-colored filter over the normally gray display to remedy that. Refinements in later LCD designs removed the need for the filter.
VFD = Vacuum Fluorescent Display. Display containing all digits sealed in a single tube generating light from an electrical discharge onto a fluorescent material. The color of the digits is normally green or blue, or somewhere in between.

Other Information:
Klixon keypad = Texas Instruments Klixon® keypad was one of the earliest keypads and used greatly by Bowmar and a few other early calculator makers. It had the four basic functions and used metal key pads about 1/2" square.
Japan (for example) = country of manufacture as stated on calculator
RPN = Reverse Polish Notation, a method of calculating and user data entry used by HP calculators. A few other manufacturers also used RPN in more limited scale.
"aka" (also known as) is used when there is another name or model variation on the calculator.
"c" (for example, c1973) is used as "circa," denoting at approximately that time.

 

A big thanks to Thomas Brockmeier, Richard Brooks, Andrew Davie, Larry Gilbert, Niels Grot, Palmer Hanson, Steve Haynes, Robert King, Kent King, Jeff Lane, Philippe Leckler, Ken Meine, Bob Patton, James Redin, and CB Wilson for their help.

 

How to Buy the Book!!!!

Collector's Guide to Pocket Calculators

by Guy Ball and Bruce Flamm

This 204 page, softcover book is the world's most comprehensive listing of electronic pocket calculators from the 1970's, the so-called Golden Age of Pocket Calculators.  Over 1,500 known calculators are detailed with information on features, size, display type, power type, and pricing.  In addition, when known, the listing also contains date of sales, original pricing, and country of origin information.

The book features over 470 photographs of various models from over 240 manufacturers around the world (including calculators from lesser-known companies in England, Switzerland, Netherlands, Spain, Germany, Bulgaria, and Russia).

"The Collector's Guide to Pocket Calculators" includes a comprehensive value guide to help you gauge rarity and desirability of the various models -- especially as they relate to each other.

The book can be purchased for $20.00 plus $5 for USA mailing ($10 for first class mailing to Canada, and $23 to other countries).  California residents please add $1.86 state sales tax.

For payment by PayPal, or for additional details and information, contact co-author Guy Ball.  Guy is happy to sign the books if asked.

 

Copyright ©1997 Guy Ball and Bruce Flamm, ©2002-2023 Nigel Tout

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2023  except where noted otherwise.