Seiko Cal. 3866 - 766

Released in 1967, the Cal. 3866 with design code 766 was part of Seiko's domestic market collection. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-ec1b4cbae7fc]

Also known as: Bullhead, Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

12.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1967

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