Seiko Cal. 6637 - 651

The Seiko 6637-651 represents an important milestone in Seiko's 1979 lineup. With its 18mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-e67deef625fe]

Also known as: Bullhead, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1979

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