Seiko Cal. 5631 - 230

This Hand-Winding model from 1982 features a 42mm PVD Black case. With its 20mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-972e0566636c]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1982

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