Seiko Cal. 6637 - 663

Released in 1980, the Cal. 6637 with design code 663 was part of Seiko's domestic market collection. With its 18mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-4dea7ecfd54c]

Also known as: UFO

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Cream

Jewels

34j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1980

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