Frederique Constant Highlife Automatic COSC 39MM WatchThe Highlife Automatic COSC timepieces have been designed for everyday use and come in several dial and case variations. COSC Certified Rarely are watches certified by the COSC (Official Swiss Chronometer Testing Institute). This certificate is only issued to pieces that can guarantee perfect isochronism over a given time and at given positions in effect, their ability to tell the time correctly, consistently and precisely, within the strict limits