Unisonic 811 Handheld Electronic Calculator

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This handheld electronic calculator has a black- and silver-colored plastic case with an array of nineteen square plastic keys. These include ten digit keys and a decimal point key (white) as well as four arithmetic function keys, a total key, a clear key, and a clear entry key (turquoise). The percentage key is orange. Above the keys and on the right is an on/off switch. Above this, on the left, a mark reads: Unisonic 811. Behind this is an eight-digit green vacuum fluorescent display. A power jack is on the back edge.
A paper sticker on the back gives calculation examples. It reads in part: 811-A. It also reads: SERIAL NO. (/) 143884 (/) MADE IN JAPAN. Below this is a compartment for four 1.5V AAA batteries.
Compare 1986.0988.113 (a Unisonic 830-A).
[Advertisement], Chicago Tribune, September 4, 1975, p. S4. A different version of the Unisonic 811 advertised as selling for $15.88.
The calculator.org website dates the Unisonic 811 to 1976.
Currently not on view
date made
ca 1976
place made
Physical Description
plastic (case; keys material)
metal (top of case; circuitry material)
glass (display material)
paper (sticker material)
overall: 1 in x 3 1/8 in x 5 1/4 in; 2.54 cm x 7.9375 cm x 13.335 cm
ID Number
accession number
catalog 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


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