This Kind of structure has a protracted history at Patek, relationship back again on the early sixties With all the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Arms-On with the 5164R in 2019, the motion from the 2597 originated within the mind of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/