Seiko Cal. 6637 - 200

The Seiko 6637-200 represents an important milestone in Seiko's 1984 lineup. Powered by the 6637 caliber with 20j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-d2d8bc9224ca]

Also known as: UFO, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1984

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