Seiko Cal. 4577 - 921

The Seiko 4577-921 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-a73ab9f1806b]

Also known as: Pogue, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

19j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1971

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