Breguet Marine Tourbillon Equation Marchante 5887

Breguet's Marine Tourbillon Equation Marchante 5887, reference 5887PT/Y2/9WV, is a 43.9 mm platinum case built around a tourbillon and perpetual calendar. The case measures 11.8 mm thick, with lugs 24.5 mm wide, and a sapphire crystal covers the blue guilloché dial. Inside runs the self-winding calibre 581DPE, offering 80 hours of power reserve alongside a running equation of time, small seconds and date. The tourbillon sits at 5 o'clock while the perpetual calendar and power reserve indicator occupy the space between 7 and 3 o'clock. Hands are treated with luminous material for night reading. A sapphire display back shows the hand-finished bridges and engraving. The alligator leather strap closes with a platinum folding clasp, and the case is rated to 100 metres of water resistance.