Concept 24 Handheld Electronic Calculator

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This handheld electronic calculator has a black plastic case with an aluminum keyboard, rounded rectangular plastic keys, and a plastic display cover. The array of twenty-four keys includes ten digit keys and a decimal point key (all white), as well as four keys for arithmetic functions, a total key, a percentage key, a square root key, and a change sign key (all blue). The four memory keys in the top row and the clear entry/clear key at the bottom left are yellow. Above the eight-digit vacuum fluorescent display, text reads: CONCEPT24. The on/off switch is on the left edge and the socket for a power adapter is on the top edge.
The back of the calculator has a compartment that holds two batteries. A sticker inside it reads: G.C. 12 (/) PASSED. Text on the back of the cover reads: Electronic Calculator (/) Power Supply 3VDC. 300mW. (/) Use 2x1.5V UM3 Batteries (/) MADE IN HONG KONG.
The calculator has a black plastic sleeve.
The Concept 24 calculator was imported, named, and sold in several versions by the discount department store Zayre.
Frederick Post , March 26, 1976, p. A8. This is a different version of the calculator. It sold for $15.88.
Currently not on view
date made
ca 1976
Zayre Discount Department Store
place made
Zhonghua: Hong Kong
Physical Description
plastic (case trim; keys; display cover; sleeve material)
metal (keyboard; circuitry material)
glass (tube material)
overall: 7/8 in x 2 3/4 in x 5 1/4 in; 2.2225 cm x 6.985 cm x 13.335 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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