Seiko Cal. 6631 - 370

This Spring Drive model from 1976 features a 41mm Gold-Plated case. Powered by the 6631 caliber with 17j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-43da50f5c720]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

17j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1976

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