Seiko Cal. 6631 - 322

Seiko 6631-322

The Seiko 6631-322 represents an important milestone in Seiko's 1973 lineup. Powered by the 6631 caliber with 30j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-9c1a0f910f0f]

Also known as: Monster, Silverwave

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
14.3mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
70m
Dial Color
White
Jewels
30j
Frequency
36,000 bph
Power Reserve
52 hours
Year
1973

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