Seiko Cal. 6631 - 947

This Spring Drive model from 1981 features a 44mm PVD Black case. With its 18mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-c47aa5336219]

Also known as: Rally, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1981

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