Seiko Cal. 4581 - 643

This Automatic model from 1975 features a 46mm PVD Black case. Powered by the 4581 caliber with 18j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-045ad144da4b]

Also known as: Monster, Helmet

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1975

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