Seiko Cal. 5639 - 631

This Spring Drive model from 1976 features a 35mm Gold-Plated case. It features a Black dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-39fc8a8ee56e]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

17j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1976

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