Seiko Cal. 5631 - 571

This Spring Drive model from 1967 features a 41mm Stainless Steel case. It features a Navy dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-8ea13e10b20f]

Also known as: Navigator, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Navy

Jewels

19j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1967

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