As the wristwatch demand was slow to take off in Germany and as many factories in Pforzheim still needed raw movements from Switzerland, Hummel’s plans were difficult to implement.
Da die Nachfrage nach Armbanduhren in Deutschland nur langsam anstieg und viele Fabriken in Pforzheim weiterhin der Rohuhrwerke aus der Schweiz bedurften, waren Hummels Pläne nur schwer realisierbar.