Seiko Cal. 6631 - 963

This Solar model from 1967 features a 41mm Hardlex-Coated Steel case. Powered by the 6631 caliber with 20j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-e0f026e0fa95]

Also known as: Monster, Crown

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1967

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