This Type of style has a long background at Patek, relationship back again into the early nineteen sixties with the ref. 2597 Travel Time Calatrava. As James Stacey mentioned in his Fingers-On with the 5164R in 2019, the movement during the 2597 originated from the thoughts of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/