Proof coins have a very high quality finish with a mirror like surface. They are sold in year sets, or very occasionally as individual coins. The packaging they are sold in will have all details of the coins inside, including the fact that they are Proof coins.
Time is the only proof.
The Royal Mint did not mint any One Penny coins from 1955 to 1960 inclusive.
The only halfpenny structure used to be where the current Sonic is on south Locust street. The above is not correct, Google "William Halfpenny" and you can then find your first clue.
You cannot say that something is "EITHER this OR that." There can be only ONE standard of PROOF. How else would anyone know what "proof" is.
An Australian 1923 bronze Halfpenny (George V), uncirculated and in absolute mint condition could fetch up to $62,000 AUD. If it has been circulated but still in good condition, it might fetch anything from $1,500 to $18,500 AUD. There were only 15,000 minted. An Australian 1923 bronze Halfpenny (George V)(Proof), uncirculated and in absolute mint condition could fetch up to $350,000 AUD. A reputable coin dealer will be able to give a more accurate valuation. After the 1930 Penny, the Australian 1923 Halfpenny is the second rarest of Australian Coins.
There is only one fool-proof method. You ask them.
Apart from "AUSTRALIA" and "HALF PENNY", the only letters on the reverse (back) of a 1942 Australian Halfpenny are "KG". They are the initials of the designer of the reverse, George Kruger Gray. The letters "HP" on the obverse (front) (below the back of the King's neck), of all Australian coins from 1938 to 1952 inclusive, are the initials of the designer of the obverse (front), T Humphrey Paget.
Boys don't do love, they do infatuation. The only proof for love is in patience and time. You won't know it's real for years.
NO
Please ask one question at a time using the format - "What is the value of a 1770 British Halfpenny". George III halfpennies were only issued in 1770 to 1775, 1799, 1806 and 1807.
Australian "Proof coin sets" were not issued prior to decimalisation, only single "proof" coins that a coin dealer may have later assembled into a set. Pre-decimal proof coins were minted in very small quantities. Assuming that your 1961 Australian proof coins are still in pristine "proof" condition, you might get the following for the individual coins - Halfpenny - $1,300 AUD Penny - $1,950 AUD Threepence - $250 AUD Sixpence - $290 AUD Shilling - $450 AUD Florin - $800 AUD As a set, you may get considerably more. A reputable coin dealer will be able to give a more accurate valuation.
The rarest Australian Halfpenny issued for general circulation would be the 1923 Halfpenny. It is thought that there were only 15,000 minted. One of these coins, even in poor condition, might fetch over $1,000 AUD. The rarest of all Australian Halfpennies is the 1916 "mule". It has the reverse of the Australian Halfpenny and the obverse of the Indian Quarter Anna coin struck on an Australian Halfpenny blank (or planchet). These are an error coin and should never have made it into circulation. It is thought that less 10 were struck and are worth tens of thousands of Dollars AUD. All known examples of this coin are accounted for.