Blancpain Villeret Réveil GMT

Blancpain's Villeret Réveil GMT, reference 6640 3642 MMB, has a 40.3 mm case in red gold. The case measures 12.1 mm thick, with a 22 mm lug width, and the dial sits under a sapphire crystal. Inside is the self-winding calibre 1240H, offering 45 hours of power reserve. This is a GMT watch with a second time zone display, and it adds a mechanical alarm alongside central seconds and a date function on the opaline dial. The combination of alarm and GMT functions in one movement is unusual and defines the piece. It comes on a Mille Mailles strap secured by a folding clasp. The case holds a 30 metre water resistance rating.