Seiko Cal. 6631 - 988

This Hand-Winding model from 1999 features a 43mm PVD Black case. With its 19mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-b0bab6f12aa9]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1999

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