Seiko Cal. 5631 - 946

This Spring Drive model from 1996 features a 38mm Hardlex-Coated Steel case. With its 18mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-753397013a1a]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1996

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