Seiko Cal. 5631 - 143

This Automatic model from 1979 features a 39mm Hardlex-Coated Steel case. With its 21mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-5eecd74280fb]

Also known as: Samurai, Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1979

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