Seiko Cal. 6639 - 720

The Seiko 6639-720 represents an important milestone in Seiko's 1979 lineup. With its 20mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-432340fff878]

Also known as: Samurai

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

White

Jewels

23j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1979

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