Seiko Cal. 6391 - 657

Seiko 6391-657

The 6391-657 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6391 caliber with 35j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-85bd205aa962]

Also known as: Bullhead, Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
38mm
Case Thickness
9.6mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
150m
Dial Color
Burgundy
Jewels
35j
Frequency
36,000 bph
Power Reserve
72 hours
Year
1965

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seikata-wm-85bd205aa962