APF Mark V Handheld Electronic Calculator

This relatively early, relatively large, handheld electronic calculator has an array of nine digit keys with a zero bar and a decimal point key below. To the right are clear entry, clear, multiplication, division, addition, and subtraction keys, as well as an equals bar. Sliding the on/off switch to the on position opens a window to reveal the eight-digit fluoresent tube display.
A mark at the top front reads: aPF Mark V. A metal plaque on the back has the title: OPERATING INSTRUCTIONS. It reads in the bottom right: JAPAN. A mark scratched below the plaque reads: M. R. (/) Williams. A sticker attached to the cover for the batteries reads: A.P.F. ELECTRONICS, INC. (/) MODEL NO. MARK-V (/) D.C. 6.0 VOLTS (4 TYPE C-CELLS) (/) CAUTION - USE ONLY MODEL (/) M5 AC ADAPTOR (/) SERIAL No. 27680 JAPAN.
The microprocessor inside the calculator is marked: TMS0101ANC[delta] (/) 7305. this indicates that the chip was made in the fifth week of 1973. It also has the logo of Texas Instruments. A mark on the back of the circuit board reads: MODEL PB-5001 E46473. A mark on the fluorescent tube reads: Toshiba (/) 6520 (/) . . .
A 1973 advertisement in the New York Times lists the calculator as selling, with power adapter, for $79.95. This example has no power adapter.
New York Times, May 6, 1973, p. 46.
Currently not on view
Object Name
electronic calculator
date made
ca 1973
APF Electronics
Physical Description
plastic (case; keys material)
aluminum (fittings material)
metal, plastic (circuits material)
average spatial: 3.8 cm x 12.2 cm x 19 cm; 1 1/2 in x 4 13/16 in x 7 15/32 in
place made
ID Number
catalog number
accession number
See more items in
Medicine and Science: Mathematics
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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