This Type of layout has a lengthy background at Patek, dating back again towards the early nineteen sixties Using the ref. 2597 Travel Time Calatrava. As James Stacey pointed out in his Palms-On Using the 5164R in 2019, the movement within the 2597 originated through the mind of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/