Seiko Cal. 6636 - 658

This Spring Drive model from 1981 features a 42mm Stainless Steel case. Powered by the 6636 caliber with 30j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-63004be153ad]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1981

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