This Sort of layout has an extended background at Patek, dating back into the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey described in his Hands-On While using the 5164R in 2019, the movement within the 2597 originated within the intellect of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/