Displays only in scientific notation - 5 digit mantissa, 2 digit exponent, red LED (made by Bowmar).
4-function, limited scientific, reverse-Polish notation (RPN).
6v (4 x AAA batteries).
50 x 111 x 19 mm (2.0 x 4.4 x 0.75 ins).
Made in England.
"Cambridge" series size, but not to be confused with the Cambridge Scientific.
Introduced 1974, initial price was £49 [about US$80] + Value Added Tax.
Was also available as a build-it-yourself kit, see below.
Bought in mid-1974, this was my first electronic calculator, it had a great battery-saving feature - Someone would come and ask if they could borrow the
calculator. After tapping some keys, they would ask where the "=" key is ? On being told it used RPN and did not have one they would hand it back and go off to find "a normal one" to borrow.