This Sort of layout has an extended background at Patek, dating back again into the early 1960s With all the ref. 2597 Travel Time Calatrava. As James Stacey described in his Fingers-On With all the 5164R in 2019, the movement from the 2597 originated through the head of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/