Frederique Constant - Highlife COSC Certified Solar Convex sapphire crystal

Convex sapphire crystal

Case Color: Stainless Steel

Size: 8 x 7 3/4 x 3 3/4 inch (20 x 19

Band Colour: Silver-Tone

Case Thickness: 10

Frederique Constant - Highlife COSC Certified Solar Convex sapphire crystalRarely 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 enforced by an ISO standard. The COSC is an independent Swiss organization that only issues its chronometer certificates to these pieces