Seiko Cal. 4521 - 347

This Spring Drive model from 1966 features a 34mm Hardlex-Coated Steel case. With its 19mm lug width and 14.5mm profile, it sits comfortably on most wrists. [seikata-wm-5ccc49417fbf]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

White

Jewels

20j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1966

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