One of the first things to check when dating Australian movie posters is the censorship details. They can often give a clue as to whether a poster is original or a re release. In the case of Doctor Zhivago, the film was released in 1965 so the censorship rating should be "Not Suitable for Children". The poster on the left carries that rating and is the original daybill for that film. The other three daybills all display an NRC (Not Recommended for Children) rating so that indicates that they must have been released in the 70s.