Seiko Cal. 3813 - 931

This Automatic model from 1977 features a 41mm PVD Black case. With its 19mm lug width and 11.0mm profile, it sits comfortably on most wrists. [seikata-wm-06f44bdad898]

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Cream

Jewels

20j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1977

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