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