This Type of layout has an extended history at Patek, courting back again into the early 1960s Along with the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Palms-On While using the 5164R in 2019, the motion during the 2597 originated with the mind of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/