Seiko Cal. 6631 - 974

The Seiko 6631-974 represents an important milestone in Seiko's 1991 lineup. Powered by the 6631 caliber with 18j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-bcfdb3a3310d]

Also known as: Sportsmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

38mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

18j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1991

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