Seiko Cal. 4578 - 941

The Seiko 4578-941 represents an important milestone in Seiko's 1967 lineup. With its 22mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-0be07aab42a8]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1967

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