Seiko Cal. 6639 - 321

Seiko 6639-321

The 6639-321 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6639 caliber with 18j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-76c8f8963eb7]

Also known as: Rally, Bellmatic

Specifications

Movement
Hand-Winding
Case Material
Gold-Plated
Case Width
45mm
Case Thickness
14.5mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
200m
Dial Color
White
Jewels
18j
Frequency
36,000 bph
Power Reserve
49 hours
Year
1988

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