Seiko Cal. 5631 - 127

This Spring Drive model from 1991 features a 41mm Stainless Steel case. It features a Green dial protected by a Hardlex crystal and offers 100m of water resistance. [seikata-wm-48e843015081]

Also known as: Turtle, Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Green

Jewels

32j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1991

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