This Sort of style has a protracted background at Patek, relationship again to your early nineteen sixties with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Arms-On Using the 5164R in 2019, the movement while in the 2597 originated through the brain of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/