This Sort of layout has a protracted heritage at Patek, dating again to the early nineteen sixties with the ref. 2597 Travel Time Calatrava. As James Stacey talked about in his Fingers-On Together with the 5164R in 2019, the movement in the 2597 originated from your mind of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/