This Sort of structure has a lengthy record at Patek, relationship back for the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey talked about in his Palms-On While using the 5164R in 2019, the movement within the 2597 originated through the head of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/