Seiko Cal. 3831 - 571

This Hand-Winding model from 1968 features a 36mm Stainless Steel case. It features a Green dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-e94280612ad9]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1968

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