Seiko Cal. 3831 - 109

This Hand-Winding model from 1974 features a 41mm PVD Black case. With its 20mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-d874507c2c15]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1974

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