Seiko Cal. 5691 - 790

This Spring Drive model from 1988 features a 40mm Titanium case. With its 18mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-d3b55096e8ad]

Also known as: Sumo, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1988

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