Seiko Cal. 6635 - 640

This Hand-Winding model from 1972 features a 41mm Hardlex-Coated Steel case. It features a Navy dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-173cb8a04419]

Also known as: Rally, Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1972

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