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.
The obverse shows the Irish harp. The reverse of all Eire decimal Halfpenny coins shows a styilised bird taken from a Celtic manuscript.
An Eire (Irish) 1939 bronze Halfpenny (pig), uncirculated and in absolute mint condition could fetch up to £175 GBP. If it has been circulated but still in good condition, it might fetch anything from £3 to £35 GBP. An Eire (Irish) 1939 bronze Halfpenny (pig)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £850 GBP. A reputable coin dealer will be able to give a more accurate valuation.
These coins are no longer in circulation since they were withdrawn and demonetised in 1987. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
These coins are no longer in circulation since they were withdrawn and demonetised in 1987. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
There was no 1939 Eire (Irish) Penny minted.
There was no Eire (Irish) 1960 Penny produced.
There were no Eire (Irish) 1957 Shillings minted.
There were was no Australian 1956 Halfpenny minted.
An Eire (Irish) 1946 cupro-nickel Threepence (hare), uncirculated and in absolute mint condition could fetch up to £40 GBP. If it has been circulated but still in good condition, it might fetch anything from £1 to £6 GBP. An Eire (Irish) 1946 cupro-nickel Threepence (hare)(Proof FDC), uncirculated and inabsolute mint condition could fetch up to £270 GBP. A reputable coin dealer will be able to give a more accurate valuation.
Please check your coin again and post a new, separate question. Canada uses cents, not pennies, and the smallest denomination is 1¢. If the coin has no country name on it and has a sailing ship on the reverse, it would be a British Halfpenny.
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.
The last Australian Halfpenny was issued in 1964.