How many movies have Hans-Jürgen Ott and Herma Koehn collaborated on?

They have worked on 3 movies together! Their first movie together was Ohnsorg Theater - Frau Pieper lebt gefährlich (1975) and was their highest rated movie together. They have not worked together since Ohnsorg Theater - Ein Matjes singt nicht mehr (1988). They are most known for their comedy films together.