Seiko Cal. 6631 - 976

The Seiko 6631-976 represents an important milestone in Seiko's 1979 lineup. Powered by the 6631 caliber with 36j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-640398b3efa6]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Champagne

Jewels

36j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1979

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