Seiko Cal. 6639 - 861

Seiko 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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seikata-wm-7ca276c7929f