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Breitling, Hamilton-Büren, Heuer and Dubois-Depraz and even Seiko all raced for the original automatic chronograph movement in the late 1960′s. I feel the best movement to be produced in this mini “Longitude” playout was the El Primero (The First). The El Primero best known for it’s Daytona fame, to modern watch lovers, originated as a work of genius by the good folks at Zenith. All of the Companies made a Chrono within months of each other, but the Primero still has that air about it. Check out history of the automatic Chronograph, it is the most important watch history in our era. CTWG