The Breitling Premier B15 Duograph 42 RB1510251B1P1 is a manual-winding chronograph featuring a split-second complication, housed in a 42mm 18k red gold case with a black dial. It is powered by the Breitling Manufacture Caliber B15, offering a power reserve of approximately 70 hours. The watch includes a black alligator leather strap with an 18k red gold folding clasp and is water-resistant up to 100 meters. Reference number: RB1510251B1P1.