Seiko Cal. 6639 - 783

Seiko 6639-783

The 6639-783 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 24j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-db122dc0baa8]

Also known as: Tuna, Sea Horse

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
35mm
Case Thickness
13.2mm
Lug Width
18mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
110m
Dial Color
Black
Jewels
24j
Frequency
36,000 bph
Power Reserve
64 hours
Year
1978

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seikata-wm-db122dc0baa8