Seiko Cal. 5631 - 121

This Hand-Winding model from 1988 features a 37mm Titanium case. The Coin-Edge bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-c17cee18cc56]

Also known as: Turtle, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

37mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

21j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1988

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