Seiko Cal. 6631 - 437

The Seiko 6631-437 represents an important milestone in Seiko's 1976 lineup. With its 19mm lug width and 13.9mm profile, it sits comfortably on most wrists. [seikata-wm-4a366f97713d]

Also known as: Pogue, Sea Horse

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

13.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1976

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