Seiko Cal. 6631 - 564

The Seiko 6631-564 represents an important milestone in Seiko's 1966 lineup. Powered by the 6631 caliber with 22j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-a1e7282bee27]

Also known as: Shogun, Bullhead

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

12.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

22j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1966

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