ONE OF THE RAREST!!!! 5131J WORLD TIME "MAP" CLOISONNE DIAL This mechanism was devised by the gifted Geneva watchmaker Louis Cottier in the early 1930s. He offered his invention to Patek Philippe in 1959, Subsequently, Cottier created another mechanism for Patek which was able to display two time zones simultaneously and ultimately inspired the development of the Calatrava Travel Time Ref 5134.