Blancpain Bathyscaphe Quantième Annuel

Blancpain's Bathyscaphe Quantième Annuel 5071 1110 NABA is a dive watch with a 43 mm steel case. The case measures 13.1 mm thick, and the unidirectional rotating bezel sits at the edge of the dial. A sapphire crystal covers the sunburst grey dial, which carries a date display and central seconds. The self-winding calibre 6054.P.4 drives the watch, offering 72 hours of power reserve and an annual calendar that tracks the date across months of different lengths. This is a useful complication for a tool watch built around such robust water resistance. Blancpain fits the piece to a NATO textile strap with a pin buckle. The case is water-resistant to 300 metres.