This Type of layout has a long heritage at Patek, courting again into the early nineteen sixties Along with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Hands-On With all the 5164R in 2019, the motion from the 2597 originated with the mind of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/