Seiko Cal. 6637 - 962

The Seiko 6637-962 represents an important milestone in Seiko's 1977 lineup. Powered by the 6637 caliber with 32j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-a41eeff4f145]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Green

Jewels

32j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1977

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