Seiko Cal. 5639 - 657

This Spring Drive model from 1981 features a 39mm Stainless Steel case. Powered by the 5639 caliber with 22j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-ed2af5fde6c9]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1981

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