Seiko Cal. 6636 - 372

The Seiko 6636-372 represents an important milestone in Seiko's 1978 lineup. Powered by the 6636 caliber with 32j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-06a132b84a35]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

14.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1978

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