Seiko Cal. 5631 - 400

The Seiko 5631-400 represents an important milestone in Seiko's 1976 lineup. With its 19mm lug width and 10.1mm profile, it sits comfortably on most wrists. [seikata-wm-088e4ddc78bc]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

39mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

170m

Dial Color

Champagne

Jewels

31j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1976

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