Seiko Cal. 6631 - 886

Seiko 6631-886

The 6631-886 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6631 caliber with 36j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-17cbb24ff13c]

Also known as: Monster

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
37mm
Case Thickness
8.9mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
60m
Dial Color
Champagne
Jewels
36j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1966

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