Seiko Cal. 5631 - 860

This Spring Drive model from 1987 features a 39mm Titanium case. With its 19mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-24e63dce79ae]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Burgundy

Jewels

22j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1987

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