Seiko Cal. 3813 - 637

This Spring Drive model from 1988 features a 35mm Stainless Steel case. Powered by the 3813 caliber with 27j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-b3dee33d648e]

Also known as: Helmet, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

12.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Black

Jewels

27j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1988

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