Enterprex Model 100M Desktop Electronic Calculator

This compact desktop electronic calculator has an ivory-colored plastic case, a brown plastic keyboard, twenty-two square plastic keys, and three rectangular plastic bars. In addition to nine digit keys, a zero bar and a decimal point key, there are bars for addition/sum and subtraction/total, keys for multiplication and division, and keys for exchange and clear/clear entry. To the left of the digit keys are six memory keys, a percentage key, and a Δ% key. Behind the keyboard are three switches and a ten-digit vacuum fluorescent display. A mark in front of the keyboard reads: ENTERPREX 100M.

The back of the calculator has a compartment for two large batteries. Below this is an indentation for a sticker, but the sticker has come loose. It reads in part: 10-DIGIT DESK-TOP (/) ELECTRONIC CALCULATOR (/) POWER SOURCE: TWO "D" CELL (/) BATTERIES. DC 3VOLT. It also reads in part: SERIAL NO. 64597 (/) PN 943014 MADE IN TAIWAN.

References:

[Advertisement], Chicago Tribune, November 5, 1978, p. M7. Enterprex 100M advertised as on sale for $20.00.

[Advertisement], Los Angeles Times, February 24, 1979, p. C2. Enterprex 100M advertised as on sale for $29.95, with a list price of $40.00

Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 70.

BE CALC Vintage Electronic Calculators website (now www.calcuseum.com). This shows an example of the calculator, with a sticker indicating that it was made in Hong Kong.

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