Calatrava watch by Patek Philippe Approx. 33mm round case 18karat yellow gold case with a hobnail "Clous de Paris" bezel White dial with Roman markers and feuille hands Subsidiary seconds Sapphire crystal window Brown leather strap with Patek Philippe tang buckle Reference #3919 Serial #2.898.928 Manual wind movement #1.826.239 Circa 1991 Patek Philippe certificate of origin, original box, and manual Made in Switzerland