Many thanks to SRAA contributor, Bob Purse, who shares the following recording and notes from his excellent website Inches Per Second:

Somewhere along the line I managed to acquire a whole bunch of someone's tapes of Australian shortwave broadcasts from the 1960's and 1970's. My un-listened-to tapes in my basement have gotten jumbled around several times over the years, so a lot of collections which were once stacked all in one place are now scattered amongst the stacks down there. And so it is that this week, I found yet another tape of Australian shortwave recordings. The recordings only include the day of the week and the date, not the year, but based on those days and dates, and the contents of the broadcasts, I am surmising the first of these to be from September of 1968 and the other to be from nearly exactly two years later.

The 1968 recording starts off difficult to hear and grows progressively worse - this is not an easy to listen to tape - such are the vagaries of listening to short wave broadcasts. The 1970 tape is considerably clearer in sound quality.