Seiko Cal. 4521 - 643

This Spring Drive model from 1966 features a 40mm Hardlex-Coated Steel case. With its 21mm lug width and 14.5mm profile, it sits comfortably on most wrists. [seikata-wm-49f9844e34f4]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1966

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