Seiko Cal. 6631 - 618

This Spring Drive model from 1991 features a 42mm Hardlex-Coated Steel case. With its 22mm lug width and 10.3mm profile, it sits comfortably on most wrists. [seikata-wm-28ee280ca694]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Burgundy

Jewels

23j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1991

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