Seiko Cal. 6639 - 657

Released in 1980, the Cal. 6639 with design code 657 was part of Seiko's domestic market collection. With its 19mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-8a09ed999fb7]

Also known as: Samurai, Sportsmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Cream

Jewels

27j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1980

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