Seiko Cal. 6639 - 632

Seiko 6639-632

The 6639-632 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 33j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-1fc6ac206db4]

Also known as: Sumo

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
34mm
Case Thickness
9.3mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
190m
Dial Color
Navy
Jewels
33j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1999

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