Seiko Cal. 3866 - 712

The 3866-712 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3866 caliber with 17j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-72f489d656a6]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Green

Jewels

17j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1965

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