Seiko Cal. 6635 - 981

The Seiko 6635-981 represents an important milestone in Seiko's 1972 lineup. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-cd41fca08922]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

30j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1972

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