Seiko Cal. 5644 - 635

This Spring Drive model from 1976 features a 42mm PVD Black case. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-1a263875f2b9]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Black

Jewels

30j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1976

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