Breguet Marine Hora Mundi 5557

Breguet's Marine Hora Mundi 5557, reference 5557BB/YS/5WV, is a GMT watch in a 43.9 mm white gold case. The case measures 13.8 mm thick, and the crown is a screwed type that secures the dual time zone function. Inside is the self-winding calibre 77F1, with 55 hours of power reserve, visible through a sapphire case back. The blue guilloché dial, finished by hand, sits under a sapphire crystal and carries luminous hands. Beyond the GMT function with its instantaneous jump and memory, the watch adds a central seconds display and a date indication. A rubber strap closes with a three-blade deployant clasp in white gold. The case is rated to 100 metres.