Seiko Cal. 3866 - 639

The Seiko 3866-639 represents an important milestone in Seiko's 1985 lineup. Powered by the 3866 caliber with 26j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-7840f5a5a68e]

Also known as: Turtle, Shogun

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

8.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

26j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1985

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