Seiko Cal. 5634 - 640

This Hand-Winding model from 1981 features a 37mm Hardlex-Coated Steel case. It features a Green dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-1d9ba5484fa0]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1981

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