Seiko Cal. 6635 - 779

Released in 1981, the Cal. 6635 with design code 779 was part of Seiko's domestic market collection. With its 19mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-e98b6db15ac9]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1981

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