Seiko Cal. 6637 - 694

The Seiko 6637-694 represents an important milestone in Seiko's 1987 lineup. Powered by the 6637 caliber with 29j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-77ffbd7c8588]

Also known as: Bullhead, Sea Horse

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1987

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