Seiko Cal. 6640 - 910

The 6640-910 is a sought-after Kinetic piece from Seiko's golden era. With its 22mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-de79943ae3e2]

Also known as: Sportsmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1979

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