How many movies have Amedeo Sollazzo and Piero Umiliani collaborated on?

They have worked on 6 movies together! Their first movie together was Oh! Those Most Secret Agents (1964) while their highest rated movie together was 2 Mobsters Against Al Capone (1966). They have not worked together since Don Franco and Don Ciccio in a Year of Protest (1970). They are most known for their comedy films together.