Seiko Cal. 4566 - 531

Released in 1968, the Cal. 4566 with design code 531 was part of Seiko's domestic market collection. With its 18mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-75597a9bb3dc]

Also known as: Bullhead, Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1968

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