Seiko Cal. 6631 - 580

The Seiko 6631-580 represents an important milestone in Seiko's 1996 lineup. Powered by the 6631 caliber with 33j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-f2f150f1f29c]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

15.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1996

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