Commodore MM2SR Handheld Electronic Calculator

This chunky handheld electronic calculator has twenty-three oval plastic keys. At the center is an array of ten digit keys with a decimal point key and a subtraction key. To the right of these are keys for multiplication, division, addition, and total. Left of the digit keys are memory, percentage, clear entry and clear keys. The row of keys at the top of the keyboard has square root, inverse, and squaring keys. The on/off switch is right of these. A mark behind the keyboard reads: commodore. Behind this is an eight-digit LED display. A socket for a power adapter is on the back edge.
The back of the calculator has a sticker with an “operating outline.” It reads in part: Model MM2SR (/) Voltage: 6V (/) Current: .2A. It also reads: Serial No. 140626. It also reads: Commodore Business Machines Inc. Made in USA.
Compare 1986.0988.128.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 58.
Los Angeles Times, October 24, 1974, p. A7. Calculator sells for $49.95.
Currently not on view
Object Name
electronic calculator
date made
ca 1974
Commodore Business Machines, Inc.
Physical Description
plastic (case; keys; display cover material)
metal (circuitry material)
glass (tube material)
overall: 1 1/4 in x 3 1/2 in x 6 in; 3.175 cm x 8.89 cm x 15.24 cm
place made
United States
ID Number
catalog number
accession number
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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