What is the value of a 19xx Australian Penny?

Answer 1

With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" pennies minted prior to 1911.

The only Pennies circulating in Australia prior to 1911 were British Pennies.

Answer 2

Australian Pennies were minted in most years from 1911 to 1964 inclusive.

Depending on the condition and the year, Australian Pennies may be worth anything from $0.50 to $500,000 AUD.