Seiko Cal. 3866 - 525

The Seiko 3866-525 represents an important milestone in Seiko's 1973 lineup. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-9f18ad15dfe0]

Also known as: Bullhead, Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

37mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

130m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1973

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