I got a bit of time this afternoon to do a little research and I found that it was a guitar and lessons that you paid off, similar to the Smoky Dawson and Tex Morton guitars, but limited to 500 members.
The club was run from Sydney and I found ads on Trove for 1946-1948, Australian Women's Weekly (opposite) and local newspapers, Longreach, Ipswich and Maryborough.
Paul brought it to me today to allow me to take a couple of photos to add to this story.
Thank you Paul, appreciate that.
If you were a member of any of the Australian Radio Listener Clubs, I would love to hear about it. I am currently working on a book of the clubs and it looks like including more than 300 clubs, but there are a few I have no information on.