Seiko Cal. 6631 - 790

Seiko 6631-790

The 6631-790 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6631 caliber with 33j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-1e0ab169ea9f]

Also known as: Monster, Shogun

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
34mm
Case Thickness
12.7mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
180m
Dial Color
Cream
Jewels
33j
Frequency
21,600 bph
Power Reserve
40 hours
Year
1965

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