How many movies have Gregorio Manzanos and José Luis de la Serna collaborated on?

They have worked on 4 movies together! Their first movie together was No somos ni Romeo ni Julieta (1969) while their highest rated movie together was El Bandido Malpelo (1971). They have not worked together since El Bandido Malpelo (1971). They are most known for their comedy films together.