Seiko Cal. 6631 - 531

The Seiko 6631-531 represents an important milestone in Seiko's 1999 lineup. Powered by the 6631 caliber with 28j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-ad8757b1ce61]

Also known as: Pogue, Sportsmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1999

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