This Type of layout has a long background at Patek, dating again on the early 1960s Using the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Arms-On Along with the 5164R in 2019, the movement while in the 2597 originated from your thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/