Oh i love this kind of chase!
I kinda get excited when i hear of a 30's pin that was converted to operate in Australia... these are just SO rare! This is pinball in its infancy and to have a machine survive this long in australia is an accomplishment in itself.. these were considered throw away items for many years, but just a few remain.
Now then... the repaint that has occured.
30's pins have a protective layer of lacquer to the outside, if the "artist" did not rub this layer back when repainting with what is always thick enamel, then you may be able to carefully remove it with a glass scraper - the type that has a razor blade as the scraper. Find a point where the enamel has chipped and you can slide the razor between the original paint and enamel. Its a long job, but sometimes you find perfect artwork underneath and the enamel has in fact protected the original artwork... its worth a try!
This guys name WILL come to me... im sure its in an old email listing i have as it was a few years ago.
Also.... can you tell whether the legs are original?? - Take a look inside or post some more pics of inside the cabinet where the legs are... she may be a converted table top as many are