Seiko Cal. 5631 - 111

This Hand-Winding model from 1972 features a 37mm Two-Tone case. It features a Navy dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-6c9c0135bc6b]

Also known as: Tuna, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Navy

Jewels

28j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1972

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