Seiko Cal. 4581 - 584

The Seiko 4581-584 represents an important milestone in Seiko's 1978 lineup. Powered by the 4581 caliber with 29j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-907dfc794b1c]

Also known as: Sportsmatic, World Timer

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1978

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