Sears 728.58850 Handheld Electronic Calculator

This is a relatively early Sears handheld electronic calculator, manufactured by Bowmar/Ali.
The calculator has a black plastic case with a plastic display window and seventeen square plastic keys with circular tops (actually two keys are rectangular bars). These include nine digit keys, zero and decimal point bars, four arithmetic function keys, a clear entry key, and a clear key. A constant switch is left of the two topmost keys and an on/off switch is to the right of them. Behind the keyboard is a red eight-digit LED display. A mark at the top reads: Sears.
A jack for a power adapter is on the right side. This example lacks an adapter.
An "OPERATING OUTLINE" in raised characters on the back of the case gives instructions. A tag at the bottom reads in part: IN ALL CORRESPONDENCE REGARDING THIS ARTICLE ALWAYS MENTION (/) MODEL (/) NUMBER 728.58850 SERIAL (/) NUMBER 251587. It also reads: Made in U.S.A. Four screws hold the back of the case to the front.
The calculator has a zippered plastic case with a belt loop at the top. Marks on the case read: Sears and: MADE IN (/) U.S.A. The case also contains a paper instruction manual.
Compare 1986.0988.204 (the Bowmar 905 from 1972). Also compare 1986.0988.362, a Sears 728.58863.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett Printing, 1997, pp. 35–36, 136.
Currently not on view
Object Name
electronic calculator
date made
ca 1973
Sears, Roebuck and Co.
Physical Description
plastic (case; keys; display cover; carrying case material)
metal (circuitry; zipper on case material)
paper (instruction manual material)
overall: 1 3/8 in x 3 in x 5 3/4 in; 3.4925 cm x 7.62 cm x 14.605 cm
place made
United States
ID Number
catalog number
accession number
Computers & Business Machines
Handheld Electronic Calculators
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of John B. Priser
Additional Media

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