Seiko Cal. 4427 - 900

This Spring Drive model from 1979 features a 43mm Two-Tone case. It features a Navy dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-874dba944e80]

Also known as: Monster, Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

14.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1979

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