How many movies have Aarre Koivisto and Walle Siivonen collaborated on?

They have worked on 6 movies together! Their first movie together was Neiti talonmies (1955) while their highest rated movie together was Pekka ja Pätkä salapoliiseina (1957). They have not worked together since Murheenkryynin poika (1958). They are most known for their comedy films together.