The Evolution Of Patek Philippe World Time Watches 2000 2014 2017 Ref.5110J Ref.7131/175R Ref. 5131/1P-001 Cal. 240 Cal. 240H Cal. 240 HU Lot4913 Lot4917 Lot4916 2008 2017 Ref.5131J Ref.7130G-015 Cal.240/229 Cal. 240 HU Lot4915 Lot4914