This Kind of structure has a lengthy heritage at Patek, relationship again into the early 1960s Together with the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Fingers-On Together 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/