APF Mark 84 Handheld Electronic Calculator

This handheld electronic calculator has an array of ten white digit keys with a white decimal point key. Right of the digit keys are orange keys for the four aithmetic functions, which also can serve as memory keys. An orange equals/constant key, which can also serve as a memory key, is next to the decimal point key. The top row has keys for percentage, clear entry/clear, and memory. The row also contains an on/off switch. Behind the keyboard is an eight-digit (or possibly nine-digit) fluorescent display. A mark at the back reads: aPF MARK 84. The hole for the adapter is on the right side.

The back of the calculator has a compartment for the battery at the top and two rubber feet at the bottom. A mark on the interior of the battery back reads: 2 (/) JAPAN (/) 0108241. A silver-colored sticker on the back reads: aPF ELECTRONICS, INC. (/) MODEL NO. MARK 84 (/) D.C. 9.0 VOLTS (/) CAUTION: Use only optional (/) A. C. adaptor model 710 or (/) 751S to operate on A. C. (/) SERIAL No: J 0119684 (/) MADE IN JAPAN.

This calculator closely resembles an APF calculator advertised in a March 1977, issue of the Los Angeles Times as selling for $7.99. That advertisement does not give a model number.

Reference:

Los Angeles Times, March 19, 1977, p. 15.

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