Seiko Cal. 3866 - 612

The 3866-612 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3866 caliber with 20j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-182f33b1e63a]

Also known as: Shogun, Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1989

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