This Type of layout has a lengthy historical past at Patek, relationship again on the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Palms-On While using the 5164R in 2019, the movement in the 2597 originated within the head of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/