Seiko Cal. 6637 - 940

The Seiko 6637-940 represents an important milestone in Seiko's 1989 lineup. With its 19mm lug width and 11.3mm profile, it sits comfortably on most wrists. [seikata-wm-3c254bd74f9b]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

30j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1989

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