Seiko Cal. 3865 - 931

This Hand-Winding model from 1967 features a 41mm Hardlex-Coated Steel case. With its 22mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-915182cfafda]

Also known as: Monster, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

8.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

White

Jewels

17j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1967

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