It is extremely unlikely that the Royal Mint struck any gold coins during WW2 while the British were funding a very expensive major war effort.
Chances are that you have a very bright Penny or Halfpenny.
In 1943 half dollars were made of silver not gold. Yours is only gold plated. The value is still about $9 for the silver it contains. The gold plating does not add any value and in some cases can destroy any value you have.
All Eire (Irish) Florins from 1928 to 1943 inclusive had a silver content of 75%.
There was no 1939 Eire (Irish) Penny minted.
There was no Eire (Irish) 1960 Penny produced.
There were no Eire (Irish) 1957 Shillings minted.
The Eire (Irish) 2 Pence was not introduced to the currency until the changeover to decimal currency in 1971.
Such a coin does not exist. The Eire Florin (Two Shillings) did not enter the Irish currency until about 1928.
Eire (Irish) coins issued from 1943 to 1969 are all much the same in each denomination as far as designs, specifications and metals are concerned.
Such a coin does not exist. The Eire (Irish) 10 Pence coin was first introduced into the currency in 1969.
Such a coin does not exist. The last Eire (Irish) Halfcrown was issued in 1967. The Halfcrown was withdrawn and demonetised after the introduction of decimal currency in 1971.
The face value of an Eire 1 penny coin is 1 penny. It was equal to 1/100 of an Irish pound before the euro.
An Eire (Irish) 1946 bronze Halfpenny (pig), uncirculated and in absolute mint condition could fetch up to £70 GBP. If it has been circulated but still in good condition, it might fetch anything from £2 to £17 GBP. An Eire (Irish) 1943 bronze Halfpenny (pig)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £300 GBP. A reputable coin dealer will be able to give a more accurate valuation.