APF Mark 65R Handheld Electronic Calculator

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This handheld electronic calculator has twenty-four indented square plastic keys. These include ten white digit keys and an eleventh white decimal point key; and keys for the four arithmetic functions as well as percentage, square root, clear entry/clear, and equals keys. Five orange memory keys are in the rightmost column. The on/off switch is above these keys on the left, and the nine-digit fluorescent display is behind this. A mark below the display reads: aPF rechargeable MARK 65r. The hole for the recharger/adapter is on the top edge.
The black plastic case has two rubber feet at the top. A silver-colored paper sticker below this reads: aPF ELECTRONICS, INC. (/) MODEL NO. MARK 65r (/) D.C. 4.5 VOLTS (/) CAUTION. Use only A.C. adaptor/recharger (/) model 751S to operate on A.C. (/) SERIAL NO. H65r-024822 (/) 7545.005 HONG KONG. Below this is the cover for the sealed battery case. A black paper sticker on this reads: THIS UNIT IS EQUIPPED WITH (/) RECHARGEABLE NICAD BATTERIES. (/) BATTERY COVER IS SEALED. (/) DO NOT ATTEMPT TO OPEN.
Ball and Flamm mention a 1977 advertisement for this calculator which gave a price of $18.95.
Compare the Sears F85 (1986.0988.182).
Guy Ball and Bruce Flamm, The Complete Collector's Guide to Pocket Calculators, Tustin CA: Wilson/Barnett, 1997, p. 30.
Currently not on view
date made
ca 1977
APF Electronics
place made
Zhonghua: Hong Kong
Physical Description
plastic (case; keys; screen material)
metal (keyboard; connection material)
rubber (feet material)
paper (stickers material)
overall: 1 in x 2 7/8 in x 4 7/8 in; 2.54 cm x 7.3025 cm x 12.3825 cm
ID Number
accession number
catalog 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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