Seiko Cal. 5631 - 841

This Spring Drive model from 1972 features a 40mm PVD Black case. With its 19mm lug width and 13.6mm profile, it sits comfortably on most wrists. [seikata-wm-f785d46c1364]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

13.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Silver

Jewels

27j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1972

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