This Sort of layout has a protracted background at Patek, relationship back for the early 1960s Together with the ref. 2597 Travel Time Calatrava. As James Stacey described in his Hands-On Along with the 5164R in 2019, the movement within the 2597 originated within the intellect of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/