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Seiko Techymeter
Model : V657-8120S Caliber V657
100m water resistant. Directional bearing on bezel. Dial techymeter.
Specifications: Calibre V657
Frequency of crystal oscillator:
32,768Hz=hertz cycles per second
Loss/gain ( monthly rate):>15seconds at normal temperature range(5c~35c)
Accuracy of alarm: ~1minute
Operational temp range: -10c~+60c (14F~140F)
Driving system: step motor, 4 pieces
Alarm: set on 12hr basis
Battery: Seiko SR927W, 1 unit
Integrated circuit: C-MOS-LSI
Degree of water resistant: 100m