Seiko Cal. 5640 - 813

This Spring Drive model from 1968 features a 37mm Titanium case. It features a Green dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-1ce5323ce896]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Green

Jewels

36j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1968

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