This Kind of layout has a protracted record at Patek, courting back again for the early sixties Together with the ref. 2597 Travel Time Calatrava. As James Stacey described in his Fingers-On with the 5164R in 2019, the movement within the 2597 originated with the mind of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/