Blancpain Villeret Quantième Annuel GMT

Blancpain's Villeret Quantième Annuel GMT, reference 6670 3642 55B, is a GMT watch with a 40 mm case in red gold. The case measures 11.1 mm thick, with lugs set at 22 mm apart, and a sapphire crystal covers the opaline dial. Inside is the self-winding calibre 6054F.4, giving 72 hours of power reserve. The watch combines an annual calendar with a GMT function, so the date only needs correcting once a year despite the varying month lengths, and it also carries a central seconds display. Blancpain fits the watch to an alligator leather strap closed with a folding clasp. Water resistance is rated to 30 metres.