Seiko Cal. 6631 - 648

The Seiko 6631-648 represents an important milestone in Seiko's 1969 lineup. With its 18mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-6b02d2e1d2b7]

Also known as: World Timer, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

10.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1969

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