Seiko Cal. 5631 - 541

This Hand-Winding model from 1978 features a 35mm PVD Black case. With its 18mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-052780790c34]

Also known as: Samurai, Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

White

Jewels

25j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1978

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