Seiko Cal. 5631 - 549

This Spring Drive model from 1978 features a 46mm Hardlex-Coated Steel case. With its 22mm lug width and 8.6mm profile, it sits comfortably on most wrists. [seikata-wm-8a83d83b413e]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

8.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

150m

Dial Color

Green

Jewels

26j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1978

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