Seiko Cal. 3860 - 637

The 3860-637 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3860 caliber with 19j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-709623aea9f3]

Also known as: Helmet, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

White

Jewels

19j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1976

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