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I think in all probability they just didn't think of adding a blank space! 

   (Both Wil)
Wheels Across A Wilderness (1966) early 16mm commercial released film daybill and one sheet film posters. 

Two things to highlight here are firstly a one sheet produced for a commercial 16mm Australian release is indeed rare. The only one that I am aware of. Secondly no blank section appearing on the bottom of the daybill, and also the one sheet. It would certainly appear that this practice of having a blank space added was only introduced at a later period of time, most likely very early 1970s with the surfing film boom.

dedeposter said:

I'd say that the 35mm prints would have been blow ups from 16mm, common practice in those days.

On checking I found that Escape World Safari!  111 was originally shot on Arrifex 16SR2 cameras (16mm). Then as you mentioned it would have been blown up to 35mm, with this being the print submitted to the Australian film  censor.

The amended New Zealand version.

The World Safari films were screened around Australia in sports clubs and small venues and posters had the blank space for screening details to be added. 

Didn't attend any screenings, but that was certainly a popular genre of films back then. An easy way to make a regular income, if you knew what you were doing.