This handheld electronic calculator has a tan plastic case and an array of twenty-four rectangular indented plastic keys. These include ten digit keys, a decimal point key (that can also serve as a memory exchange key), a percentage key, a total key, four arithmetic function keys (one of which can also serve as a squaring key and another as an inverse key), a square root key, four memory keys, a clear entry/clear key, and a function/clear function key.
Behind the keys is an eight-digit red LED display. A worn mark above it once read: UNITREX. The on/off key is on the right side and the power jack is on the left side.
A sticker on the inside of the battery compartment on the back reads: 9 VOLT BATTERY. The compartment cover is missing. Text at the bottom of the case reads: HONG KONG.
The model number is deduced by comparing this object to objects on websites and in printed sources.
References:
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 171.
[Advertisement], Progress Bulletin [Pomona, California], March 28, 1977, p. 26. Calculator selling for $7.99.
Vintagecalculators.com website.
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