This Type of layout has a protracted history at Patek, relationship back to your early nineteen sixties Using the ref. 2597 Travel Time Calatrava. As James Stacey pointed out in his Arms-On Together with the 5164R in 2019, the motion from the 2597 originated in the thoughts of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/