Such A style and design has a lengthy heritage at Patek, dating again for the early 1960s Using the ref. 2597 Travel Time Calatrava. As James Stacey outlined in his Palms-On Together with the 5164R in 2019, the movement in the 2597 originated with the intellect of Louis Cottier – https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/