Seiko Cal. 4451 - 636

This Spring Drive model from 1983 features a 40mm PVD Black case. Powered by the 4451 caliber with 31j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-e4bb2d1f6634]

Also known as: Bullhead, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

13.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1983

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