Seiko Cal. 6634 - 913

Seiko 6634-913

The 6634-913 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6634 caliber with 27j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-28d4bab975af]

Also known as: Monster, Tuna

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
34mm
Case Thickness
11.1mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
27j
Frequency
21,600 bph
Power Reserve
40 hours
Year
1984

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