Seiko Cal. 4556 - 874

This Spring Drive model from 1976 features a 36mm Hardlex-Coated Steel case. Powered by the 4556 caliber with 20j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-c469df32e7ec]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1976

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