Seiko Cal. 6631 - 647

The Seiko 6631-647 represents an important milestone in Seiko's 1984 lineup. With its 20mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-2fa3e21a6440]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1984

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