Seiko Cal. 6636 - 154

This Automatic model from 1971 features a 38mm Stainless Steel case. Powered by the 6636 caliber with 24j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-4d3dde79b066]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

12.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

24j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1971

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