Seiko Cal. 3866 - 993

The Seiko 3866-993 represents an important milestone in Seiko's 1979 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-6808e6dd31da]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1979

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