Seiko Cal. 6637 - 812

The Seiko 6637-812 represents an important milestone in Seiko's 1992 lineup. Powered by the 6637 caliber with 19j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-1fd4bd18a379]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Champagne

Jewels

19j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1992

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