Incomplete question -
Whatever it is, it does not exist.
With the possible exception of traders tokens (with the traders business name on them), there was no "Australian" currency prior to 1910.
The only currency circulating in Australia prior to 1910 were British Coins.
Insufficient information, what country is it from, what condition is it in? it is an australian penny in good condition
1 Australian dollar is worth 1.06 Dollar in US
its worth as much as someone wants to pay
about 134 dollars
500000 Australian dollars is worth 407350 Euros as of 19th February 2012.
1 Australian dollar is worth 1.06 NZ dollars.
its worth 0.81
it is probaly if in good condition worth from $100 to $1000 dollars
Australia uses the Australian Dollar.
1 Australian dollar = 1.0264 US.
About 29$
$5