How many movies have Albert Zahn and Hans Hardt-Hardtloff acted in together?

They have worked on 13 movies together! Their first movie together was Der Prozeß wird vertagt (1958) while their highest rated movie together was Carbide and Sorrel (1963). They have not worked together since Mohr und die Raben von London (1969). They are most known for their drama films together.