Hi Paul,
Firstly thanks for posting the photos.
I'll have to say this one has me quite intrigued as it's colour is somewhat unusual. It still looks like one of the very last Adelaide built machines, but already sports a new Eagle Farm built ID plate. Sadly we can't read anything from it as all the screen printing is now illegible.
I'd say it's got a hammertone finish on it which suggests Adelaide but we're lead to believe that the first Queensland built machines may have still been painted while the powder coating line was still being finalised. I will say you are far better off with a painted unit opposed to the ill-fated Powder Coating that they had in all the later Eagle Farm built Kermit Greens and Rover Reds.
Your machine has at some stage been re-powered with a Tecumseh engine replacing the Original 3HP Briggs power plant.
I will say that these single vertical thumpers aren't that kind on the chassis rails opposed to the newer style sloper engines like the Honda's and new Briggs engines. These are far kinder to the rails and reduce the issue of fatigue cracking.
Cheers,
BB.