Seiko Cal. 3866 - 740

The Seiko 3866-740 represents an important milestone in Seiko's 1968 lineup. With its 22mm lug width and 15.8mm profile, it sits comfortably on most wrists. [seikata-wm-49b19b7a3488]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1968

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