Seiko Cal. 6631 - 520

Seiko 6631-520

The Seiko 6631-520 represents an important milestone in Seiko's 1976 lineup. Powered by the 6631 caliber with 22j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-9320216ef196]

Also known as: Rally

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
34mm
Case Thickness
13.4mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
40m
Dial Color
Black
Jewels
22j
Frequency
36,000 bph
Power Reserve
68 hours
Year
1976

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