Seiko Cal. 6637 - 377

The Seiko 6637-377 represents an important milestone in Seiko's 1974 lineup. With its 20mm lug width and 10.1mm profile, it sits comfortably on most wrists. [seikata-wm-e9f6a4d58d54]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

10.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1974

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