Seiko Cal. 4431 - 227

This Automatic model from 1979 features a 37mm PVD Black case. Powered by the 4431 caliber with 35j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-8f5e392b73cc]

Also known as: Monster

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1979

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