How many movies have O.P. Nayyar and S.H. Bihari collaborated on?

They have worked on 3 movies together! Their first movie together was Yeh Raat Phir Na Aaygi (1966) and was their highest rated movie together. They have not worked together since Pran Jaye Par Vachan Na Jaye (1973). They are most known for their romance films together.