APF Mark 40 Handheld Electronic Calculator

APF Mark 40 Handheld Electronic Calculator

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Usage conditions apply
This handheld electronic calculator has a light tan plastic case and a gray plastic keyboard. It has an array of eighteen rectangular keys with oval corners. These include ten digit keys and a decimal point key, keys for the four arithmetic functions, an equals/constant key, a percentage key, and a clear entry/clear key. The eight-digit LED display is behind the keyboard. The battery compartment opens from the back at the top. The device has two plastic feet. The socket for the adapter is on the right.
A mark on the front reads: aPF MARK 40. The paper tag on the back reads: aPF ELECTRONICS, INC. (/) MODEL NO: MARK 40 (/) D.C. 9.0 VOLTS (/) CAUTION: Use only model 710 (/) or 751S adaptor (optional) to (/) operate on A. C. (/) SERIAL No: R-0205395 (/) MADE IN JAPAN.
According to an advertisement in the May 30, 1975, Los Angeles Times, the APF Mark 40 sold for $13.88, with an additional $3.95 for the adaptor. In July, 1976, it was advertised there as selling at a sale price of $5.99 with an additional $3.99 for the adapter. The January 4, 1976, Chicago Tribune gives a regular price of $12.99, a sale price of $9.97 and a price for the adapter of $3.99.
Compare 1986.0988.329 (a Montgomery Ward P90).
Chicago Tribune, January 4, 1976, p. 12
Los Angeles Times, May 30, 1975, p. B23.
Los Angeles Times, July 8, 1976, p. B13.
Currently not on view
Object Name
electronic calculator
Other Terms
electronic calculator; Handheld
date made
ca 1975
APF Electronics
place made
Physical Description
plastic (overall material)
metal (circuitry material)
paper (sticker material)
overall: 1 1/4 in x 2 in x 4 1/2 in; 3.175 cm x 5.08 cm x 11.43 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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I have a APF Mark 40, which I found in the desk drawer at my grandmother's house. Happily the battery had been removed, to my surprise when I connected a new battery, it showed a 0. It worked except the 3, 6, and 9 keys: I disassembled the keyboard unit and found/bridged an open copper trace. Now 100% functional, I think I'll use it another 40 years.

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