Radio Shack EC-250 Handheld Electronic Calculator

This handheld electronic calculator is one of a series of such calculators introduced by Bowmar in the early 1970s and sold by that company and distributors such as Radio Shack. The calculator has a black plastic case with eighteen plastic keys, sixteen of them square. These include ten digit keys, a decimal point key, four arithmetic function keys, a total key, a percentage key, and a clear/clear entry key. The on/off switch is on the keyboard, the eight-digit display behind this. The plug for the power supply is on the right side. A mark above the display reads: Radio Shack.
A sticker on the back of the calculator gives operating instructions. It reads in part: Radio Shack EC-250 (/) ELECTRONIC CALCULATOR. It also reads in part: RADIO SHACK A TANDY CORPORATION COMPANY (/) FORT WORTH, TEXAS 76107 (/) ASSEMBLED IN U.S.A. SERIAL NO. 111396. Above the sticker is a compartment for two AA batteries. A mark on the inside of the compartment reads: C905-051.
Compare 1986.0988.059, a Bowmar MX-55.
No advertisements found in Radio Shack catalogs.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 120.
Currently not on view
date made
ca 1974
Tandy Corporation
place made
United States
Physical Description
plastic (case; keys; display cover material)
metal (circuitry material)
paper (sticker material)
overall: 1 1/4 in x 3 in x 5 3/4 in; 3.175 cm x 7.62 cm x 14.605 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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