Casio 121-E Desktop Electronic Calculator

This compact, nonprinting desktop electronic calculator has a black plastic case and gray keyboard. At the center of the keyboard is an array of nine digit keys with a zero bar and a decimal point key below. On the right are keys for arithmetic functions and memory. On the left are clearance, total and percentage keys. Behind the keyboard are tubes for the twelve-digit display. On the right side is an on/off switch. This example lacks a power cord.
A tag on the bottom reads in part: Casio 121-E. It also reads: SERIAL NO. B 706848 (/) CASIO COMPUTER CO., LTD. MADE IN JAPAN. Another tag reads: QCNo. Q 7470. A piece of tape on the bottom reads: 5/13/74. A tag on the back reads: FOR SERVICE CALL (/) FOREMOST BUSINESS MACHINE CO. (/) 871-0053 MINNEAPOLIS, MINNESOTA.
The approximate date of 1974 is taken from the tape on the bottom of the machine.
Currently not on view
Object Name
electronic calculator
date made
ca 1974
Casio Computer Company, Ltd.
Physical Description
plastic (case, keys material)
glass (display tubes material)
overall: 7 in x 8 in x 2 13/16 in; 17.78 cm x 20.32 cm x 7.112 cm
place made
ID Number
catalog number
accession number
See more items in
Medicine and Science: Computers
Desktop Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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