This Kind of structure has an extended heritage at Patek, dating back to your early 1960s Using the ref. 2597 Travel Time Calatrava. As James Stacey stated in his Arms-On Using the 5164R in 2019, the movement from the 2597 originated from your head of Louis Cottier – The daddy https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/