Seiko Cal. 6613 - 640

Released in 1979, the Cal. 6613 with design code 640 was part of Seiko's domestic market collection. With its 20mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-1a32fb02cf92]

Also known as: UFO, Arnie

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1979

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