Seiko Cal. 6639 - 861

The 6639-861 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6639 caliber with 20j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-7ca276c7929f]

Also known as: Turtle, Sumo

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1986

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