This Sort of style and design has a protracted background at Patek, dating back to the early 1960s with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Hands-On Using the 5164R in 2019, the movement from the 2597 originated with the brain of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/