APF Mark 23 Handheld Electronic Calculator

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This white and black calculator has black number entry and digit keys. It also has white arithmetic function keys, a clear entry/clear key, a percentage key, an x/y exchange key, and an equals key. Pushing a read function key allows one to switch the function of the white keys to memory keys, a square root key, an inverse key, and a square key . The display shows nine digits. The non-printing device has a sealed, rechargeable battery. It fits in a plastic sleeve.
A mark behind the keyboard reads: aPF MARK 23 (/) Electronic Slide Rule Calculator. A plaque on the back gives operating instructions. A mark on it reads: MARK 23 (/) Model No. Another mark on it reads: J-007440 (/) Serial Number. Another mark there reads: APF ELECTRONICS INC. (/) NEW YORK, N.Y. 10022 (/) MADE IN JAPAN.
A May 1976 advertisement in the Los Angeles Times lists the APF Mark 23 as regularly priced at $39.95 and on sale for $29.99.
Los Angeles Times, May 28, 1976. p. D5.
Currently not on view
date made
ca 1976
APF Electronics
place made
Physical Description
metal (keyboard material)
plastic (overall material)
overall: 1 in x 3 in x 6 1/4 in; 2.54 cm x 7.62 cm x 15.875 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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