Seiko Cal. 3866 - 520

The Seiko 3866-520 represents an important milestone in Seiko's 1973 lineup. With its 18mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-3c86ef1f02af]

Also known as: Bullhead, Flighty

Specifications

Movement

Solar

Case Material

Titanium

Case Width

46mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1973

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