Seiko Cal. 3859 - 866

The 3859-866 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3859 caliber with 30j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-545cab77db1c]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

30j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1967

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