This Sort of style and design has a long background at Patek, relationship again for the early sixties With all the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Fingers-On Using the 5164R in 2019, the movement within the 2597 originated through the brain of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/