Seiko Cal. 5635 - 641

This Spring Drive model from 1988 features a 39mm Gold-Plated case. Powered by the 5635 caliber with 27j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-f3090e09c628]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1988

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