The "Junkers J1" Special version is dedicated to an plane that took for the skies only once and however represented a revolution. Strictly restricted to 1915 parts. With the development of the first metal 5164A in 2011, Patek included their Calibre 324 S C FUS, an automatic 4 Hz movement https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/