Seiko Cal. 4431 - 406

This Spring Drive model from 1984 features a 37mm Stainless Steel case. It features a Black dial protected by a Acrylic crystal and offers 130m of water resistance. [seikata-wm-76b7c6d1bec3]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

14.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1984

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