Seiko Cal. 5631 - 653

This Spring Drive model from 1977 features a 38mm Titanium case. Powered by the 5631 caliber with 18j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-5dfaccdaa471]

Also known as: Bullhead, Flighty

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1977

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