Seiko Cal. 6639 - 901

Seiko 6639-901

The 6639-901 is a sought-after Spring Drive piece from Seiko's golden era. The Fixed bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-b54bf5e7a7bf]

Also known as: Bullhead

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
34mm
Case Thickness
14.0mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
160m
Dial Color
Blue Sunburst
Jewels
17j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1976

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