Breguet Classique Tourbillon Extra-Plat 5377

Breguet's Classique Tourbillon Extra-Plat 5377, reference 5377PT/12/9WU, comes in a platinum case measuring 41 mm across. The case stands just 7.1 mm thick, slim enough to house an off-centred tourbillon with a titanium cage and silicon balance spring. A sapphire crystal covers the hand-guilloché silver dial, finished by hand and fitted with Breguet's traditional hollow apple hands. The self-winding calibre 581 DR drives the piece and stores 80 hours of power reserve, shown on the dial alongside small seconds. The tourbillon itself remains visible from the front, and the sapphire caseback reveals the finishing of the movement from behind. An alligator leather strap closes with a platinum folding clasp. Water resistance is modest: the case is rated to 30 metres.