Seiko Cal. 3811 - 331

This Spring Drive model from 1979 features a 46mm Hardlex-Coated Steel case. With its 21mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-1e6e73587e44]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

14.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Champagne

Jewels

24j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1979

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