This Type of structure has a protracted record at Patek, courting again on the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Hands-On Together with the 5164R in 2019, the movement inside the 2597 originated within the brain of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/