How many movies have Pehr-Olof Sirén and Sven Ehrström acted in together?

They have worked on 2 movies together! Their first movie together was Landet som icke är (1977) while their highest rated movie together was Herr Puntila And His Servant Matti (1979). They have not worked together since Herr Puntila And His Servant Matti (1979).