Seiko Cal. 6131 - 640

This Spring Drive model from 1986 features a 42mm Stainless Steel case. With its 21mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-2050207cd4b7]

Also known as: UFO, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1986

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