Seiko Cal. 5631 - 631

This Kinetic model from 1979 features a 40mm Titanium case. With its 22mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-4bc79ddc817c]

Also known as: Monster

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1979

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