This Type of structure has an extended history at Patek, courting back again to your early 1960s Along with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Arms-On Using the 5164R in 2019, the movement in the 2597 originated within the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/