I have one of these, but mine is not polished like the image above. I knew they were a bit scarce, but I had no idea on the price. BTW I have several hundred Australian pennies, I bought them when the A$ was low and shipping halfway around the world was inexpensive. They all date from 1912-1964, numerous dates, mintmarks etc.
Oz pennies are one of the most fascinating collecting areas around so much variety with mints, dates etc.