How many movies have Paul Otto and Werner Krauß acted in together?

They have worked on 6 movies together! Their first movie together was Die Tochter der Gräfin Stachowska (1917) while their highest rated movie together was Robert Koch, der Bekämpfer des Todes (1939). They have not worked together since Robert Koch, der Bekämpfer des Todes (1939).