NOTE - Polishing a coin of any value, will destroy whatever value it might have.
An Australian 1922 Penny, uncirculated and in absolute mint condition could fetch up to $1,400 AUD. If it has been circulated but still in good condition, it might fetch anything from $0.75 to $185 AUD.
There were 12.697 million minted.
A reputable coin dealer will be able to give a more accurate valuation.
None. It is illegal to deliberately damage, deface or otherwise mutilate Australian coins.
As far as general circulation coins are concerned, easily the most valuable Australian Penny is the 1930 Penny and the most valuable Halfpenny would be the 1923 Halfpenny.
All Australian Pennies minted from 1938 to 1964 inclusive feature a kangaroo on the reverse. The only Australian coins to feature wheat was the 1938 to 1964 inclusive, silver Threepence coins.
The Australian Penny with the kangaroo on the reverse was first issued in 1938. There were some "Pattern" coins minted in 1937, but the very few of them that were minted, will all be in museums.
If you refer to general circulation Australian Pennies rather than Proof coins, the order runs something like this - 1. 1930 Penny is the rarest 2. 1920 Penny with no dots on the reverse 3. 1925 Penny 4. 1946 Penny
No Australian Penny has ever been minted in gold, they were made from bronze. If you have a gold Penny, it will be because somebody has gold plated it, perhaps to commemorate or celebrate a significant event for somebody. Modified coins have no collector value.
Modified or damaged coins have no collector value.
Nothing. Modified coins have no collector value.
All Australian Pennies minted from 1938 to 1964 inclusive feature a kangaroo on the reverse. The only Australian Coins to feature wheat was the 1938 to 1964 inclusive, silver Threepence coins.
If you are convinced that you have a genuine Australian 1930 Penny, a reputable coin dealer will be able to give an accurate valuation and provide authentication and verification. Do be aware that there are legal replicas or copies of these coins as distinct from forgeries.
No circulating Australian coin has ever been minted that includes a hole in the design. If your coins have holes in them, somebody put them there so that the coins could be worn as a pendant or similar.
The 1944 Australian Penny was minted at one of two mints. Melbourne Mint (no mintmark - 2.45 million minted. Perth Mint (mintmark = Y.) - 27.83 million minted.