Seiko Cal. 3831 - 257

This Hand-Winding model from 1980 features a 38mm Two-Tone case. It features a Green dial protected by a Hardlex crystal and offers 100m of water resistance. [seikata-wm-033439d02fd1]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

100m

Dial Color

Green

Jewels

35j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1980

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