This Sort of layout has an extended historical past at Patek, relationship back for the early 1960s While using the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Hands-On Together with the 5164R in 2019, the movement from the 2597 originated with the brain of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/