Seiko Cal. 6631 - 151

This Spring Drive model from 1974 features a 40mm Titanium case. It features a Green dial protected by a Hardlex crystal and offers 170m of water resistance. [seikata-wm-450b4fe4fe40]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

170m

Dial Color

Green

Jewels

35j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1974

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