Look forward to seeing your images Blue. As per your suggestion, I did a quick newspaper search on Trove and came up with some interesting ads for the Automatic. The earliest reference I could find was the following Canberra Times advertisement from the 24th of August, 1957:
The next Images come from an advertisement that ran in the Women's Weekly from the 4th of December 1957, to the 12th of March, 1958:
The last advertisement is the latest mention of the Automatic I could find, and dates to the 13th of March, 1958. It mentions the "new" Rotomo, which appears to have superceded the Automatic:
All the above offers an interesting snapshot on the model, and much food for thought.