Patek Philippe Calatrava in 18K yellow gold. Manuel Wind with subseconds, Ref # 3919. Circa 1993. Mint Condition Pre-owned Patek Philippe Watch. Classic Patek Philippe Calatrava 3919 watch is made out of 18K yellow gold on a Black Alligator band with a 18K yellow gold tang buckle. This Patek Philippe watch has a 33 x 33 mm case, 6.6 mm thickness with a Round caseback, White Roman Numeral dial, 18K yellow gold Pull-Push Crown and Bezel. Scratch Resistant Sapphire Crystal. Water Resistant 100 Ft, 30 Meters. Factory Patek Philippe Box and Papers, One Year Warranty.