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