This Type of structure has an extended background at Patek, courting again for the early sixties While using the ref. 2597 Travel Time Calatrava. As James Stacey pointed out in his Hands-On with the 5164R in 2019, the motion within the 2597 originated within the brain of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/