How many movies have Giorgos Mattheou and Omiros Efstratiadis collaborated on?

They have worked on 9 movies together! Their first movie together was Στον δάσκαλό μας με αγάπη (1969) and was their highest rated movie together. They have not worked together since Η μπάτσα αρχιφύλαξ Νατάσα (1987). They are most known for their drama films together.