Seiko Cal. 4531 - 421

This Automatic model from 1988 features a 41mm PVD Black case. Powered by the 4531 caliber with 33j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-420be3c7c567]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1988

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