The C359 caliber was Seiko's Very rare vintage second digital LCD calculator watch. This C359-5000 was produced in 1980. It can display hours (AM/PM), minutes, seconds, the day of the month and the weekday and has a light for the LCD. The alarm can be set for a 24 hour interval (AM/PM) and an hourly chime can be set. The eight digit calculator provides the 4 basic calculating operations. Specifications Brand Seiko Caliber C359 Case C359-5000 Stainless steel Bracelet CA090 Stainless steel Crystal ES0W36GN Glass Movement C359A 4001590 Panel 4510590 Width 34.3 mm Height 37.8 mm Thickness 9.4 mm Lug size 20.0 mm Weight 68 g Functions Time, Seconds, Alarm, Chime, Calculator, Light, Day/Month, Day of Week, 12h Battery SR926W/SR927W, 399/395 Manufactured 12/1979 Bracelet 20 cm