This Sort of structure has an extended heritage at Patek, relationship back again to the early 1960s Along with the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Palms-On with the 5164R in 2019, the movement from the 2597 originated within the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/