Seiko Cal. 6631 - 206

Seiko 6631-206

This Spring Drive model from 1972 features a 44mm Stainless Steel case. Powered by the 6631 caliber with 31j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-d1199ca1b0c5]

Also known as: Bullhead, Arnie

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
44mm
Case Thickness
12.7mm
Lug Width
21mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
100m
Dial Color
Silver
Jewels
31j
Frequency
36,000 bph
Power Reserve
68 hours
Year
1972

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