Calfax 890P Handheld Electronic Calculator

This handheld electronic calculator has a plastic case. The oval plastic keys are colored red (the percentage, constant, and clear/clear entry keys), white (the ten digit keys and the decimal point key) and blue (the four function keys and the total key).
Behind the keyboard is an on/off switch; behind it is an eight-digit red LED display
A sticker behind the display reads: calfax 890P. A socket for an adapter is on the top edge. This example has no adapter.
The battery compartment on the top of the back would hold two batteries. This example presently has no batteries. A tag on the back reads: Serial No. (/) 615066 (/) MADE IN HONG KONG.
The "calfax" mark on the calculator uses a trademark reportedly first used in commerce in 1972, filed in the United States January 1973, and registered in September 1975. No trademark registration is indicated on this example.
An advertisement in the Washington Post published in July of 1976 shows several Calfax calculators, including a Calfax 890P. It emphasizes the advantage of the percent key. At that time, the model had a sale price of $7.99.
Compare 1988.0988.202.
Washington Post, July 28, 1976, p. A16.
Currently not on view
Object Name
electronic calculator
date made
ca 1976
Physical Description
plastic (case; keys; display cover material)
paper (sticker material)
metal (circuitry material)
overall: 1 1/2 in x 3 in x 5 1/2 in; 3.81 cm x 7.62 cm x 13.97 cm
place made
Zhonghua: Hong Kong
ID Number
catalog number
accession number
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
Credit Line
Gift of John B. Priser
Additional Media

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