Seiko Cal. 3860 - 640

The Seiko 3860-640 represents an important milestone in Seiko's 1977 lineup. Powered by the 3860 caliber with 25j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-6d882b366d63]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

Cream

Jewels

25j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1977

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