Casio Pocket-Mini Handheld Electronic Calculator

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This compact handheld electronic calculator has a black case with an aluminum front. The keyboard has an array of square plastic keys, including ten digit keys, a decimal point key, a total key, and, to the right of the digit keys, four keys for arithmetic functions. Left of the digit keys are an AC (all clear) key, a clear (entry) key, a percentage key, and a memory key. Behind the keyboard is an eight-digit vacuum fluorescent display. A mark above this reads: CASIO pocket-mini (/) ELECTRONIC CALCULATOR
The on/off switch is on the left side near the top. The socket for an adapter is on the right side near the base.
At the top of the back is a compartment for two AA batteries. A sticker inside the battery compartment reads: 0773177. A mark at the base of the back reads: CASIO pocket-mini (/) BATTERY SUPPLY 1.5Vx2 (/) or use AC ADAPTOR AD-2S (/) 0.2W (/) P-810 MADE IN JAPAN (/) BM CASIO COMPUTER CO. LTD.
The device has a black plastic carrying pouch. A mark on it reads: MADE IN TAIWAN.
A different form of the Pocket-Mini (the CP 801-C), which lacked a memory key, was advertised as new in the May 21, 1975, Chicago Tribune. The P-810 was among the Casio calculators with memory advertised from October 21, 1975. It sold for $19.95. By March 1977 the sale price was $14.95. The web site of Casio Corporation indicates that the calculator was introduced in 1974.
Casio Corporation website.
Chicago Tribune, May 21, 1975, p. 14.
Chicago Tribune, October 21, 1975, p. B3.
Los Angeles Times, October 21, 1975, p. B16.
Chicago Tribune March 2, 1977, p. B8.
Currently not on view
date made
Casio Computer Company
place made
Physical Description
plastic (case; display cover; keys; circuit board; pouch material)
metal (keyboard; circuitry material)
overall: 3/4 in x 2 1/4 in x 4 in; 1.905 cm x 5.715 cm x 10.16 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


Hello, I found this website for searching the build date of my calculator. I bought my CASIO pocket-mini electronic calculator in 1976 in Colchester UK. I was there for a Philips computer workshop. I use this very pretty calculator still often and in the past years I changed approx. 5 times the two penlite batteries. The calculator is in perfect condition and the serial number is 0773562.
Just loaded with fresh batteries, still using my P810!
Love my little Casio Pocket-Mini!! I've been using it almost daily for 42 years and it's never failed me. It's my own little piece of history!

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