Seiko Cal. 3860 - 640

The Seiko 3860-640 represents an important milestone in Seiko's 1967 lineup. With its 22mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-0fd813af1844]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Champagne

Jewels

23j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1967

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