This Kind of layout has an extended background at Patek, dating back to the early nineteen sixties Along with the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Hands-On With all the 5164R in 2019, the movement from the 2597 originated with the intellect of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/