Such A structure has an extended heritage at Patek, courting back for the early 1960s With all the ref. 2597 Travel Time Calatrava. As James Stacey talked about in his Arms-On Together with the 5164R in 2019, the movement while in the 2597 originated within the intellect of Louis Cottier https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/