This Kind of structure has a lengthy background at Patek, courting back again on the early sixties with the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Hands-On Together with the 5164R in 2019, the movement during the 2597 originated from your intellect of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/