Gents Patek Philippe Calatrava in 18k on alligator strap with 18k tang buckle. Comes with Archive papers. Auto. Ref 5120J. Fine Pre-owned Patek Philippe Watch. Certified preowned Dress Patek Philippe Calatrava 5120J watch is made out of yellow gold on a Black Leather band with a 18k tang buckle. This Patek Philippe watch has a 35 x 35 mm case with a Round caseback and White Roman Numeral dial. It is Gray and Sons Certified Authentic and comes backed by our 12-month warranty. Each watch is inspected by our certified in-house Swiss-trained watchmakers before shipment including final servicing, cleaning, and polishing.