Very handsome 18K yellow gold cufflinks from the "Calatrava" collection by Patek Philippe. These have the same workmanship around the edge as the Calatrava series watches, commonly known as the hobnail bezel, along with a white agate insert. Excellent workmanship and very smart cufflinks. Hallmarks: Patek Philippe, Swiss, Swish Hallmarks, Geneve, 750.