This Kind of style has a protracted heritage at Patek, dating back again to your early sixties Using the ref. 2597 Travel Time Calatrava. As James Stacey pointed out in his Arms-On Along 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/