Such A layout has a lengthy background at Patek, relationship back again to the early sixties Along with the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Arms-On Using the 5164R in 2019, the movement while in the 2597 originated with the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/