Seiko Cal. 5640 - 774

This Hand-Winding model from 1970 features a 37mm Hardlex-Coated Steel case. It features a Silver dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-9f02174a7a74]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1970

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