This Type of structure has a long heritage at Patek, courting back again to your early sixties with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Palms-On With all the 5164R in 2019, the movement from the 2597 originated through the head of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/