Seiko Cal. 5640 - 131

This Spring Drive model from 1973 features a 34mm Stainless Steel case. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-77d0803b3744]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1973

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