This Sort of structure has an extended history at Patek, relationship back to the early 1960s With all the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Fingers-On with the 5164R in 2019, the movement while in the 2597 originated from your intellect of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/