There were a lot of coins minted in 1819 with George III on them, and not necessarily British.
The following are British Coins -
Sovereign (22 carat gold) 22.05 mm in diameter.
St George and the dragon on reverse.
Crown (sterling silver) 37.6 mm in diameter - edge inscription = LIX or LX.
St George and the dragon on reverse.
Halfcrown (sterling silver) 32 mm in diameter.
Crowned garter and shield on reverse.
Shilling (sterling silver) 23.5 mm in diameter.
Crowned garter and shield on reverse. The edge is milled.
Sixpence (sterling silver) 19 mm in diameter.
Crowned garter and shield on reverse. The edge is milled.
Please decide which you have and submit a new question.
The value of a Quatro De Peso 1823 coin can vary based on its condition, rarity, and demand from collectors. It is recommended to consult with a numismatic expert or appraiser to get an accurate assessment of its value.
Please look at your coin again. It's likely not a dollar or not from 1823. No U.S. dollars were made in 1823.
If the coin is still in collectible condition, average value is about $60.00.
It is a medal, not a coin and they are worth $30 - $35.
Look at the coin again, no half dimes were struck in 1823.
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What is the value of a 1939 dime coin and the value of a 1944-1945 dime
Most likely it is real. However to be sure just take it to your local coin collector.
There were no 1914-1918 George V commemorative coins issued. Since the years correspond to World War 1, you may have a medal or medallion.
The value of a George VI half crown coin will depend upon its condition and how much the seller wants for it. You can expect to pay anything in the region of $1-$30 for this coin at auction.
Please check your coin, George III died in 1820.