Seiko Cal. 4431 - 709

This Spring Drive model from 1978 features a 40mm Titanium case. It features a Green dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-8d96763a8029]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

13.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1978

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