Seiko Cal. 6637 - 263

This Spring Drive model from 1972 features a 34mm Stainless Steel case. Powered by the 6637 caliber with 25j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-36c7b5d50038]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

8.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

White

Jewels

25j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1972

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