Breguet Marine Hora Mundi 5557

Breguet's Marine Hora Mundi 5557, reference 5557BR/YS/5WV, is a GMT watch in rose gold measuring 43.9 mm across. The case stands 13.8 mm thick with lugs spaced 24.5 mm apart, and a sapphire crystal covers the blue guilloché dial, finished by hand. The self-winding calibre 77F1 drives the movement, offering 55 hours of power reserve, and can be viewed through a sapphire caseback. Beyond the central seconds and date, the watch's main function is its dual time zone system, which allows instantaneous change of the second city via the pusher without disturbing the running of the watch. Hands are treated with phosphorescent material for visibility. A rubber strap closes with a rose gold folding clasp. Breguet rates the case to 100 metres.