Breguet Marine 5517

Breguet's Marine 5517 (5517BB/Y2/BZ0) is a 40 mm case in white gold. The case measures 11.5 mm thick, with lugs set 22 mm apart, and the dial sits under a sapphire crystal. Inside is the self-winding calibre 777A, with a power reserve of 55 hours. The blue guilloché dial carries a central seconds hand and a date aperture, and the hands are luminous. A sapphire display back shows the automatic movement and its oscillating weight. The screw-down crown and white gold bracelet close with a folding clasp, also in white gold. Breguet rates the case to 100 metres.