Seiko Cal. 6631 - 861

This Automatic model from 1971 features a 46mm Stainless Steel case. Powered by the 6631 caliber with 23j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-7f515d01234a]

Also known as: World Timer, Sea Horse

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Burgundy

Jewels

23j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1971

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