How many movies have F.M. Schilder and Walter Gross collaborated on?

They have worked on 4 movies together! Their first movie together was Mikosch, der Stolz der Kompanie (1958) while their highest rated movie together was Immer die Mädchen (1959). They have not worked together since Schlagerparade 1960 (1960). They are most known for their comedy films together.