How many movies have Duilio Giustini and Giuseppe Franciosi collaborated on?

They have worked on 3 movies together! Their first movie together was I due maggiolini più matti del mondo (1970) while their highest rated movie together was Il clan dei due Borsalini (1971). They have not worked together since Continuavano a chiamarli... er più e er meno (1972). They are most known for their comedy films together.