Seiko Cal. 6631 - 628

The Seiko 6631-628 represents an important milestone in Seiko's 1987 lineup. Powered by the 6631 caliber with 24j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-159aca626b22]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

24j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1987

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