Seiko Cal. 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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