Sharp CT-500 Handheld Electronic Calculator

This compact instrument combines a handheld electronic calculator, an alarm clock telling time in several time zones, and a stop watch. It has a metal case and lid and an array of twenty-four small rectangular plastic keys. Operated as a calculator, it has ten digit keys, a decimal point key, a % key, four arithmetic function keys, a square root key, a clear/clear entry key, three memory keys, a recall key, and an hours/minutes/seconds key. Keys also can be used in “clock” mode to set the location (time zone), time, date, and alarm time, and to turn the alarm on or off. An eight-digit LCD display is behind the keyboard.

Marks printed on the back of the calculator read in part: ELECTRONIC CALCULATOR (/) CT 500. The also read: SER NO 71063319 BM (/) PRODUCED BY (/) SHARP CORPORATION JAPAN.

The calculator fits in a plastic case lined with red felt. Text at the base of the front of the case reads: ELSI MATE. Text on the back at the base reads: MADE IN JAPAN.

Reference:

[Advertisement], Los Angeles Times, June 25, 1978, p. Y17. Sharp CT-500 “world clock” on sale for $67.95.

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