Radio Shack EC-300 Handheld Electronic Calculator

This relatively early handheld electronic calculator has a brown and tan plastic case and twenty-four square plastic keys. These include ten digit keys, a decimal point key, a D key for refreshing the display, a total key, four arithmetic function keys, a % key, a clear entry/clear key, and a negative entry key. The top row of the keyboard has four memory keys. Behind the keys on the right is an on/off switch. Behind this is an eight-digit LED display. A mark above the display reads: Radio Shack. The back edge has a cord for charging.
The back of the calculator has a sticker with “abbreviated instructions.” Text at the bottom of this reads: RADIO SHACK A TANDY CORPORATION COMPANY (/) FORT WORTH, TEXAS 76107 (/) RADIO SHAK MODEL EC-300 (/) SERIAL NO. A2 300-20590.
The calculator has a black plastic zippered carrying case with a cloth cord.
Compare 1986.0988.035.
Radio Shack, A Tandy Company, 1974 Electronics Catalog , p. 66, accessed September 22, 2014, at Calculator has a list price of $114.95.
Currently not on view
Object Name
electronic calculator
date made
Tandy Corporation
Physical Description
plastic (case; keys; carrying case material)
metal (circuitry material)
paper (sticker material)
overall: 1 3/4 in x 3 1/8 in x 5 3/4 in; 4.445 cm x 7.9375 cm x 14.605 cm
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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