High-performance quartz digital watch
with a calculation function.Seiko Checkmate Calculator Alarm C359

The Checkmate Calculator alarm C359, a high-performance digital quartz watch that included a calculation function, with the LCD display on the top and the numeral and symbol buttons laid out on the bottom, was introduced in 1979. The buttons for the calculator function were extremely small, so a stylus was included for pressing the buttons. Both the case and the bracelet are made of stainless steel, giving the impression that the entire product is smoothly connected. The black coloring surrounding the LCD and buttons gives it an intelligent appearance.
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