Seiko Cal. 6637 - 839

Released in 1970, the Cal. 6637 with design code 839 was part of Seiko's domestic market collection. With its 19mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-2737da8322fb]

Also known as: Bullhead, Rally

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

41mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Burgundy

Jewels

18j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1970

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