Seiko Cal. 6631 - 688

The Seiko 6631-688 represents an important milestone in Seiko's 1979 lineup. Powered by the 6631 caliber with 33j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-121be6bd7015]

Also known as: Samurai

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

9.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Champagne

Jewels

33j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1979

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