Seiko Cal. 0731 - 140

This Spring Drive model from 1979 features a 40mm Titanium case. With its 20mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-86c124bff371]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1979

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