Seiko Cal. 3866 - 731

This Hand-Winding model from 1981 features a 35mm Stainless Steel case. With its 22mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-86e05b47390d]

Also known as: Monster, World Timer

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1981

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