APF Mark 61 Handheld Electronic Calculator

This compact handheld electronic calculator has eleven white plastic keys, ten for digits and one for a decimal point. It also has four gray plastic memory keys and eight tan plastic keys. The tan keys are for arithmetic operations, square root, percentage, clear entry/clear, and equals. The display is behind the keys. A mark above it reads: aPF EXECUTIVE. Battery sealed. A hole for the adapter and recharger is on the back edge.

A metal tag on the back reads: aPF EXECUTIVE (/) MODEL NO.:MARK 61 (/) D.C. 2.4 VOLTS (/) CAUTION: USE ONLY (/) A.C. ADAPTOR (/) RECHARGER MODEL 751S to OPERATE (/) ON A.C. Another mark there reads: SERIAL NO:A012559 (/) APF ELCETRONICS INC. (/) NEW YORK, N.Y. 10022 (/) MADE IN JAPAN.

No advertisements have been found for this calculator. Ball and Flamm say that the calculator has a fluorescent display and cost $19.85 in 1977.

Reference:

Guy Ball and Bruce Flamm, The Complete Collector"s Guide to Pocket Calculators, Tustin CA: Wilson/Barnett,1997, p. 30.

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