PATEK PHILIPPE CALATRAVA REF. 3919 NO. 28792XX YELLOW GOLD WRISTWATCH PATEK PHILIPPE CALATRAVA REF. 3919 NO. 28792XX 18kt yellow gold case, integrated case back, "Clous de Paris" yellow gold bezel, crown marked, white dial, black graphics, Roman numerals, seconds at six o'clock, manual winding movement cal 215 no. 1820053, non-original black leather strap with 18kt yellow gold buckle marked Patek Philippe, gr. 40. Diam. mm 33.