Seiko Cal. 5631 - 301

The Seiko 5631-301 represents an important milestone in Seiko's 1977 lineup. With its 19mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-70cd014e0f99]

Also known as: Sea Horse

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

23j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1977

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