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The Collector's Guide to Pocket Calculators lists over 1,500 models of early pocket calculators from over 220 companies.

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.

Go to  J   K   L   M   N   O

J

Japy (French watch manufacturer)

• 103, similar to the Unicom 103.

JCE (John Colling Enterprises, U.S. company)

• ALK (also seen is ALK-1), 4-functions, red LED, 5-AA batt.
• Mark II, listed in book.
• Percent, listed in book.
• Super "D", listed in book.

JC Penney (US 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 Commdore MM3 model, United Kingdom. Photo

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

• 8P, 4-funct, amber tubes, battery-level meter, 4-C rep. batt., 216x120x32mm / 8.5x4.75x1.25", Japan. photo.

K

Karstadt (German company)

• MR40, listed in book.

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

• Class Computer, 4-function, horse-racing form functions, red LED, Singapore. Jan 07.

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 (European market calculator)

• WP3, 4-funct, %, sq rt, sgn chg, 8 digit red LED, 4-AAA rep batt, white color, 2.25x4.5". Photo.

Keon

• KE-003, 4-function, red LED, has very large keys Jan 07.

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

• 88, listed in book. Featured calculator.
• 98, listed in book.
• 108, listed in book.
• 370, listed in book.
• 390, listed in book.
• 395, listed in book.
• 2010, listed in book.
• 2030, listed in book.
• 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.

King Sonic

• King Sonic aka 3000, similar to Bohsei 3000. Photo.  See also the "Standard Type 1 Calculator" page. Featured 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.
• 8412 "Micro Memory", listed in book.
• 8413 "Micro Algebra", listed in book.
• 8414 "Micro Executive", listed in book. Photo.
• 9202, listed in book.
• FN-85, listed in book.
• KP-9, 4-function, %, memory, red LED, 9v PP3 rep batt, Korea. Jan 07.
• KP-200, listed in book.
• KP-450, listed in book.
• PC-2, listed in book.
• PC-50, 4-functions, metric conversion, red LED, 9v batt.
• SC-11, listed in book.
• SC-20, listed in book.
• SC-33, listed in book.
• SC-40, listed in book.
• SC-44, listed in book.
• SC-44F, listed in book.
• SC-60, listed in book.
• SC-6010, listed in book.
• SCM-100, listed in book.

Kitlex

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

Kosmos

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

Kovac (European market calculator)

• 888MR, 4-function, %, memory, red LED, snap on cover goes over keys. Jan 07.
• K-82DP, 4-function, %, green fluorescent, 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 (there is nother version with a "D" key, to refresh the display). Photo, inside.
• Mini, listed in book.
• Pocket mini P-80, 4-function, sq rt., green VFD. Photo.
• Pocket Memory P-81 4-funct, mem, sq rt, %, chg sgn, green fluor, 2-AA rep batt, 3.0x5.25" (7.6x13.6 cm), Japan. 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.

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.

Lecom (Nothing known about this company, please email us if you any have information)

• 12, 4 function, 6 digits red LED, 4-AA rep batt, 3.7x6.0", country of manufacture unknown, fixed decimal point (switchable 0 or 2 places), Klixon keyboard (2nd issue), some transistors date coded 1973. Photo.

Lexicon

• LK_3000, listed in book.

Litronix (U.S. company)

• 1000 aka Triton 1000, listed in book.
• 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.
• 1101P, listed in book.
• 1102, listed in book.
• 1102A, listed in book.
• 1502 aka Avatar, listed in book.
• 1602 aka memory, listed in book.
• 1603 aka slide rule, listed in book.
• 1700 aka Checkmate 1700, listed in book.
• 1720 aka Checkmate 1720, listed in book.
• 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.
• 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.
• 2250R aka slide rule, listed in book.
• 2260, listed in book.
• 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.
• 2290R aka programmable, listed in book.

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". Jan 07.

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.
• 30 aka EH-9036-0018, listed in book.
• 40, listed in book.
• 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.
• 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.
• 311, listed in book.
• 320, listed in book. Photo.
• 321, listed in book.
• 322, listed in book.
• 333, listed in book. Photo.
• 334, listed in book.
• 335, scientific, blue VFD.
• 340, listed in book.
• 341, listed in book.
• 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.
• 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.
• 907, listed in book.
• 908, 4-functions, memory, sq rt., blue V.F.D.
• 999, listed in book. Photo.

Logitech

• Logitech 1, listed in book.

Longines Symphonette

• LTP 5405, listed in book.
• Battery-AC Electronic Calculator, listed in book.
• Electronic Calculator, listed in book.

M

Mach

• Mach I aka Sliderulette, listed in book.
• Mach II aka Mini Calculator, listed in book.

Magiclick (Made and distributed in Spain by eye S.A.)

• 350, 4-function, %, mem, sq. rt., red LED, 9v PP3 rep. batt., 125x70x22mm /  4.9x2.75x0.9", Spain, c1975, has multiple memory with three independent registers. Photo . Oct 07.

Manica

• 8, listed in book.

Mannics

• 303, listed in book.

Mariner (NRC, New York)

• NRC-720, 4-function, red LED, rech batt, Klixon keypad. Jan 07.

Maruman

• Cigarette-lighter/calculator, 4-func, %, mem, sq rt, 8 digits yellow LCD. Photo 1, photo 2.

Master Calculator Company (U.S. company)

• Mini Master, listed in book.

Mathbook

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

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. Mar 08.

Mathmatic (American Circuitron Inc., Hamden, Conecticut,  U.S.A.)

• 777, 4-functions, %, memory, red LED, 9v batt.
• 879, 4-functions, %, sq rt, red LED,  9v batt. Jan 07.
• 888, 4-functions, %, memory, red LED, 3-C rech. batt., U.S.A., c1975. Photo. Mar 07.
• S-666, listed in book.
• S-888, listed in book.

Mattel (U.S. company)

• JR Ewing, listed in book.

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

• 2W01B, listed in book.

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

• 570, listed in book.
• 838MD, listed in book.
• 3050 4 funct, mem, %, sq, 8 digit green fluor, 2-AA rep batt, 3.0x5.5", black color. Photo.
• alpha 1000-1, scientific, 8 digits, green VFD, 2-AA rep. batt., 86x161x25mm / 3.4x6.3x1.0", Japan. Photo.
• de Luxe I, 4 function, %, 8 digits, green VFD, 2-AA rech. batt., 78x137x25mm / 3.1x5.4x1.0", c1975. Photo.
• Derby 1 4-funct, %, fluor, 1-AA rep batt, 2.75x4.3", c1975.
• SC-40, scientific, red LED.

MD1 and MD2 (found in Europe. No details available about this company. If you have any information please get in touch.)

• 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.

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., U.S.A.)

• 40 aka Maximus 40, listed in book.
• 50 aka Maximus 40, listed in book.
• 370, 4-function, red LED, 9V rep batt, membrane keypad. Jan 07.
• 380, listed in book. Photo, photo inside.
• 390, listed in book.
• 392, listed in book.
• 400, listed in book.
• 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. Jan 07.
• 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.
• SC-535, listed in book.
• SC-615, scientific, red LED. Jan 07.
• SC-635, listed in book.
• SC-645, scientific, red LED, U.S.A. Jan 07.
• SR8 "ANSWERMATH", 4-function, %, memory, sq rt, red LED. Jan 07.

Memory Devices (East Molesey, Surrey, England.)

• Memory ESR-817, Scientific, green VFD in a single tube, 4-N rech batt., 83x143x21mm / 3.25x5.7x0.8", 1974. Featured British calculator.

Memory Master (European market calculator)

• Memory Master, 4 function, %, memory, red LED, 3-AA rep batt, 75x153x20mm / 3.0x6.0x0.8". Photo. Feb 08.
• 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.

Metronic Laboratories (U.S. company)

• Execucal M55, listed in book.

Micro Instruments & Telemetry Systems (MITS) (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.
• 1209, listed in book.
• 1212, listed in book. Photo. Featured calculator.

Microcifra (Fate Electronica, Argentinian company)

• 4, 4-function, %, memory, red LED, 6- AA rep. batt., Argentina. Jan. 07.

Microlith

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

Miida

• 8, listed in book.
• 606, listed in book.
• 808, listed in book.
• 809, listed in book.
• 828, listed in book.
• 838, listed in book.
• 918, listed in book.
• 988, listed in book.
• MC855M, listed in book.
• MC868M, listed in book.
• MC918, 4-function, %, green VFD.

Minerva (U.S. company)

• 825, listed in book.

Minipet

• Executive 8, 4-function, %, red LED, Ni-cad rech. batt. pack, 68x121x18mm / 2.7x4.75x0.7", Singapore. Photo, photo with batt. pack . Aug 07.

Minipet

• V-2, 4-functions, memory, green VFD, 4-C batt.
• V-2, 4-functions, %, memory.

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-funct, %, sq rt, green VFD, 135x80mm / 5.3x3.2", 2-AA rep batt, Korea. Photo.
• 812D, listed in book.
• 822DR, listed in book.
• 845D, listed in book.
• 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. Apr. 07.

MITS - See Micro Instruments & Telemetry Systems

M-OFFICE (If you have any information about M-OFFICE please get in touch)

• 18S, 4-function, %, 8 digits (7 digits if -ve. !) red LED, 9v rep. batt., 180x64x24mm / 7.1x2.5x0.9". Photo.

Monroe-Litton (U.S. company)

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

Monte Carlo

• Monte Carlo, listed in book. Featured calculator.

Monteverdi

• Monteverdi, listed in book.

Montgomery Ward

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

Morse Electrophonic

• Cal-801, listed in book.

MPI

• 360, listed in book.

Mustang

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

N

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

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

• 1844, listed in book.

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.
• 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.
• 820, 4-function, red LED, Singapore, 9v rep batt. Photo.
• 821, 4-function, %, red LED, 9v rep batt, U.S.A.
• 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. Feb 08.
• 826, listed in book.
• 830 aka Datachecker, listed in book.
• 831, listed in book.
• 832, listed in book.
• 835, listed in book. Photo.
• 835A, listed in book. Photo.
• 842, listed in book. Photo.
• 850, listed in book.
• 850A, listed in book.
• 852, listed in book.
• 900, listed in book.
• 950, listed in book.
• 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 Slderule, listed in book. Photo.
• 4510 aka Mathematician, listed in book.
• 4515 aka Mathematician PR, listed in book.
• 4520 aka Scientist, listed in book.
• 4525 aka Scientist PR, listed in book.
• 4615, listed in book.
• 4640, listed in book.
• 4650, listed in book. Photo.
• 4660, listed in book.
• 6020 aka Financier, listed in book.
• 6025 aka Financier Programmable, listed in book.
• 6030 aka Statistician, listed in book.
• Attache, listed in book.
• Billfold 91, 4-function, %, memory, square-root, red LED, 9v Durecall "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. Aug 07.
• CM IV, listed in book.
• Executive, listed in book.
• Financier, financial, red LED, 9v PP3.
• Financier PR (6025), financial, programmable, red LED, 9v PP3.
• International Computer, 4 function, %, memory, metric conversion, red LED, PP3 rep batt, Hong Kong. Photo.
• Mathematician, listed in book. Photo, inside, calculator with alternative style keyboard.
• Mathematician PR, scientific, programmable, red LED.
• Scientist, listed in book.
• Statistician, listed in book.
• Statistician PR (6035), statistics, programmable, red LED.
• Quiz Kid, listed in book.
• Whiz Kid, listed in book.

Navtronic see Specialized Electronics Corp.

NCR see National Cash Register.

Nestler (German office equipment company)

• OD 1002A, 4-funct, mem, %, sq rt, green fluor, 2-AA rep batt, 79x123x22mm/3.1x4.8x0.9".  Photo.

Netronics

• 1000, listed in book.

Neutron

• 210-B, 4-function, %, sq rt., green VFD.

Nixdorf

• LK-3000, listed in book.

Nobility

• K14/350, listed in book.
• 3000, listed in book.

Novax

• TN-85, 4-function, %, green VFD. Nov. 07.

Novus - see National Semiconductor.

Numerex

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

O

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

• 8002, 4-funct, %, 8 digit blue fluor, 4-AA rep batt, 83x134x27mm / 3.3x5.3x1.1", Japan. Photo.

Okhai (Scottish company)

• 8P. Featured British calculator.

Olivetti (Italian company)

• BC-D18 aka Divisumma-18, listed in book.
• 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^[1], and so resemble Panasonic models.)

• 108MS, listed in book.
• 816MS, listed in book.
• 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-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.

Omron (Omron Tateisi Electronics Co., Japan)

• 8, listed in book. Photo. Photo.
• 8M, listed in book.
• 8P, 4-function, %, sq rt., blue VFD. Jan 07.
• 8SM, 4-function, %, memory, sq rt., blue VFD, 2-AA.
• 8SR, listed in book.
• 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. Jan 07.
• 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.
• 606, listed in book.
• 821, 4-function, %, blue VFD, Japan.
• 860, listed in book.
• 865R, listed in book.
• 8300, listed in book.

Ordibel Collators

• Executive, listed in book.

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

• Orion, 8 digits, green VFD, unusual since the battery compartment is detachable and can be replaced with an AC module. Photo, photo with AC module removed .

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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 $23.95 plus $4 for USA first class mailing ($2 for US mailing via slower book rate, $6 for first class mailing to Canada and Mexico, and $8 for airmail to other countries). California residents please add $1.86 state sales tax.

!!!! SPECIAL OFFER !!!!

As a special offer, mention this page (newcalc1) and deduct $4 off the price of the book. This offer is only valid if you mention this page. We're trying to see how many people actually read this. If you do, it is a great way to get a great price on a great book!!

Mail to:
Wilson/Barnett Publishing
P.O. Box 345, Tustin, CA 92781-0345, USA
For additional information, contact co-author Guy Ball for additional details and purchase information.

References:

1. Milton, R., Beaumont, A.J. (1974), Electronic Calculator Markets and Suppliers, 2nd. ed., Finresearch Series, London: Ovum, 50.

Copyright ©1997 Guy Ball and Bruce Flamm, ©2002-2008 Nigel Tout

Vintage Calculators

© Text & photographs copyright Nigel Tout  2000-2008 except where noted otherwise.