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