Seiko Cal. 5639 - 631

The Seiko 5639-631 represents an important milestone in Seiko's 1977 lineup. The Fixed bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-96e66f3bb2c0]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

White

Jewels

21j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1977

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