Seiko Cal. 6638 - 980

The Seiko 6638-980 represents an important milestone in Seiko's 1972 lineup. With its 18mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-2e9b7fd80d68]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

White

Jewels

23j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1972

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