Not enough information to answer - what is the denomination of the coin (1 shilling, 1 penny) and what condition is it in?
Whatever it is, such a coin does not exist. King George IV died in 1830.
Such a coin does not exist.
King George V died in January 1936 and was replaced by King Edward VIII who abdicated in December 1936.
All British 1937 coins have King George VI on the obverse.
There were no Edward VIII coins issued for circulation in Britain. The Royal Mint had started work on the usual range of coins prior to Edwards abdication and only a very few pattern coins of any denomination were actually struck.
Those very few coins would currently only exist in musuems.
If you could manage to get one out of the museum, the British 1937 nickel-brass Threepence (dodecagonal)(Edward VIII), is thought to be valued at about £35,000 GBP.
Such a coin does not exist. King George V died in 1936 and King George VI died in 1952.
Between $1.60 and $17.
George V. Brown died in 1937.
George V (1910-36) Halfpennies were made from bronze. If you have a gold Halfpenny, it is because somebody gold plated it. Modified coins have no collector value.
Between $13 and $230. In the future please include the condition of the coin so I can value it more precisely for you.
Between $25 and $318. In the future please add a condition of the coin so I can value it more precisely for you.
Between $1.70 and $12. In the future, please add a description or condition of the coin so I can value it more precisely for you.
Between $3 and $54. In the future please add a condition of the coin so I can value it more precisely for you.
Between $3 and $60. In the future please add a condition of the coin so I can value it more precisely for you.
Between 38 cents and $35. In the future please add the condition of the coin so I can value it more precisely for you.
I am unfamiliar with the reference to "centre diamond" on an Australian George V Penny. Please provide more information.
King George V