Patek Philippe – Reference 5230 World Time Patek Philippe by wholesalewatches - April 7, 20180 We owe the world time display on the Patek Philippe Reference 5230 (and indeed on other high-end world time watches) to a 1953 patent by Louis Cottier, a watchmaker from Carouge, who succeeded in displaying on a watch dial the notion of coordinated universal time devised by Sandford Fleming.