What is an Australian Farthing?
There has never been an "Australian" Farthing minted, issued or
circulated as a part of Australia's coinage.
The only Farthings or fractional Farthings to ever circulate in
Australia, would have been British coins prior to the 1910 and 1911
introduction of the new Australian coinage.
It is most likely that many British coins were still circulating
in Australia for quite a few years after 1910.