Seiko Cal. 4431 - 556

The Seiko 4431-556 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-3bd3a2cd9f46]

Also known as: Shogun, Navigator

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1971

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