Seiko Cal. 6631 - 129

Seiko 6631-129

The 6631-129 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6631 caliber with 31j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-7684eae975f6]

Also known as: Monster, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
45mm
Case Thickness
10.5mm
Lug Width
22mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
200m
Dial Color
Burgundy
Jewels
31j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1979

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