Hi Chris,
I don't suppose you have a close-up of the HG Noble dealer plate?
I think Noble's was a Queensland Ag-supply company.
It's rare to find dealer plates on AUS rotaries (usually stickers).
N.B. Mal, you asked me if I had some images of the other two versions
that were unknown to you. I have placed them in the relevant post (above).
All very interesting.
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Jack