This Sort of design has a lengthy background at Patek, courting back again towards the early 1960s with the ref. 2597 Travel Time Calatrava. As James Stacey described in his Arms-On Together with the 5164R in 2019, the movement in the 2597 originated in the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/