During the reign of King George IV, copper Pennies were only minted from 1825 to 1827 inclusive. A British 1825 Penny, uncirculated and in absolute mint condition could fetch up to £475 GBP. If it has been circulated but still in good condition, it might fetch up to £12 to £200 GBP. A British 1825 Penny (Proof FDC), in absolute mint condition could fetch up to £1,150 GBP. A British 1826 Penny (plain saltire on reverse), uncirculated and in absolute mint condition could fetch up to £475 GBP. If it has been circulated but still in good condition, it might fetch up to £10 to £175 GBP. A British 1826 Penny (Proof FDC)(plain saltire on reverse), in absolute mint condition could fetch up to £600 GBP. A British 1826 Penny (thin line on saltire on reverse), uncirculated and in absolute mint condition could fetch up to £475 GBP. If it has been circulated but still in good condition, it might fetch up to £10 to £225 GBP. A British 1826 Penny (Proof FDC)(thin line on saltire on reverse), in absolute mint condition could fetch up to £450 GBP. A British 1826 Penny (thick line on saltire on reverse), uncirculated and in absolute mint condition could fetch up to £575 GBP. If it has been circulated but still in good condition, it might fetch up to £15 to £250 GBP. A British 1826 Penny (Proof FDC)(thick line on saltire on reverse), in absolute mint condition could fetch up to £400 GBP. A British 1827 Penny (plain saltire on reverse), circulated but still in good condition, it might fetch anything from £160 to £1,950 GBP. A reputable coin dealer will be able to give a more accurate valuation.
Value depends on grade & condition and goes from about $15.00 in G-4 to $450.00 in MS-60
In not very good condition it has a value of about $15.
Since there were no British pennies issued in 1818 I assume you referring to a U.S. cent. At that time both coins were similar in size. Values for an 1818 U.S. cent range from about $25 in worn condition, up to $150 if almost uncirculated.
With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" pennies minted prior to 1911.
There were no U.S. dimes minted in 1818.
George A. Boardman was born in 1818.
George Sirian was born in 1818.
George Copway was born in 1818.
George Repton was born in 1818.
Miss Liberty is on that coin and she is not a REAL person
George Fowler Jones was born in 1818.
George Charles Hawker was born in 1818.