This Sort of layout has an extended heritage at Patek, relationship back for the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Hands-On With all the 5164R in 2019, the movement inside the 2597 originated with the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/