Casio LC-785 Handheld Electronic Calculator

This credit card-sized, lightweight handheld electronic calculator has an aluminum case and brown plastic keys. In addition to an array of ten digit keys, a decimal point key, and a total key, it has a column of four arithmetic function keys immediately to the right of the digit keys, and a column with a percentage key and three memory keys on the far right. The square root, C (clear), and AC (all clear) keys are left of the digit keys. The on/off switch is next to the AC key.
The eight-digit liquid crystal display is above and to the left of the keyboard. A mark below it reads: CASIO LC-785 (/) ELECTRONIC CALCULATOR. A mark on the back reads: CASIO LC-785B (/) BM MADE IN JAPAN RATING: DC 3V 0.00025W (/) USE BATTERY 1.5Vx2.
A screw on the left side of the back holds it to the front. Unscrewing it reveals the circuitry. A sticker on the inside of the back of the case reads: 1D202A.
The calculator fits in a leather pouch which also has a booklet of instructions printed in English, German, French, Spanish and Italian. A mark on the pouch reads: CASIO.
Several advertisements for the LC-785 appeared in late 1981. None found specifically mentions the LC-785B. The Casio website lists the LC-785 as a product of Casio in 1982.
Washington Post, October 23, 1981, p. B10. This gives a regular price of $13.95 and a sale price of $11.95.
Los Angeles Times, October 31, 1981, p. D3. This gives a regular price of $12.95.
Los Angeles Times, November 29, 1981, p. G26. This gives a regular price of $16.99 and a sale price of $10.99.
Casio website .
Currently not on view
Object Name
electronic calculator
date made
Casio Computer Company
Physical Description
metal (case; circuitry material)
plastic (keys; circuit board material)
paper (sticker material)
overall: 1/8 in x 3 1/2 in x 2 1/2 in; .3175 cm x 8.89 cm x 6.35 cm
place made
ID Number
accession number
catalog number
Handheld Electronic Calculators
Computers & Business Machines
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

Visitor Comments

4/12/2016 3:14:51 AM
Ross Harman
I bought one in Singapore 1981, still have it, still use it, have not changed the battery!
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