Its elliptical shape results from an advanced study of the anatomy of the wrist and specifically the oval zone on which the wristwatch rests. Self-winding movement. Monocoque case, hermetically sealed crystal assuring water-resistance to 30 m. Dial in harmony with the decidedly functional look of the watch for easy legibility of the hour, the minute and the second thanks to concentric time "zones" and contrasting coloured hands. A new look to the bracelet too: a single piece screw-in into a circular groove under the case by a steel ring; cut in Corfam, a porous synthetic material pierced with 30 aerating holes; widened near the case to fit firmly and comfortably on the wrist. Crown integrated to the case in order not to break the aerodynamic line which inspired this famous model's name.