Seiko Cal. 4425 - 400

This Spring Drive model from 1983 features a 36mm PVD Black case. It features a Black dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-131df32968d4]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1983

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