How many movies have Ennio De Concini and Oscar De Arcangelis collaborated on?

They have worked on 3 movies together! Their first movie together was Legions of the Nile (1959) while their highest rated movie together was The Treasure of San Gennaro (1966). They have not worked together since The Treasure of San Gennaro (1966). They are most known for their comedy films together.