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With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" halfpennies minted prior to 1911.
A 1793 Sr Isaac Newton copper Halfpenny token, depending on condition, might fetch anything from £5 to £30 GBP. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
There were was no Australian 1956 Halfpenny minted.
The last Australian Halfpenny was minted in 1964.
The last Australian Halfpenny was minted in 1964.
The last Australian Halfpenny was issued in 1964.
There was no 1948 New Zealand Halfpenny minted.
Any Halfpenny coins circulating in Gibraltar in 1917 would have been British Halfpenny coins.
The Royal Australian Mint produced no Australian Halfpenny coins from 1956 to 1958 inclusive.
The Halfpenny has never been minted in silver. If you have a "silver" Halfpenny, it is possibly because somebody has silver plated it. Modified coins have no collector value. For future reference, please provide a year.
The British Halfpenny was first produced about 1300 AD to replace the custom of cutting Penny coins in half to achieve the required value. Many countries of the British Empire/Commonwealth also produced a Halfpenny coin for their respective currencies. Most of those countries including Australia, Britain, New Zealand and South Africa, to mention a few, produced a Halfpenny coin in 1942. The US has never minted half penny coins. The US made half cents from 1793 to 1857.
The Royal Australian Mint produced no Australian Halfpenny coins from 1956 to 1958 inclusive.