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.
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