Seiko Cal. 3866 - 442

The Seiko 3866-442 represents an important milestone in Seiko's 1972 lineup. With its 20mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-0379048a0906]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1972

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