There were several British Coins minted in 1821 that match that description.
Sovereign (gold) 22.05 mm in diameter.
Half-Sovereign (gold) 19.3 mm in diameter.
Crown (silver) 37.6 mm in diameter.
Halfcrown (silver) 32 mm in diameter.
Shilling (silver) 23.5 mm in diameter.
Sixpence (silver) 19 mm in diameter.
Identify your coin and submit a new question.
You have described every British coin issued in 1797. Please provide the type of metal it appears to be made from, the diameter of the coin, the inscriptions and the design on the reverse.
Your coin is either a British 1797 "Cartwheel" Twopence 41mm in diameter, or a British 1797 "Cartwheel" Penny 36mm in diameter. If somebody has drilled a hole in it, it might be worth a few Pence. Modified coins have no collector value.
Apart from George III, the only person depicted on British 1797 coins is Britannia, the female personification of Britain. She is usually shown as being seated and holding a trident and shield. In 1797 she is on the reverse of the "Cartwheel" Twopence and the "Cartwheel" Penny.
Such a coin does not exist. George III was born in 1738 and was king from 1760 to 1820.
Please check your coin, George III died in 1820.
If you refer to the British 1797 Penny and Twopence coins, they may have been cursed by the people who had to use them. Both coins were very big and very heavy, even by the standards of the day. The 1797 "Cartwheel" Penny weighed 1 ounce or 28.35 grams and was 36 mm in diameter. The 1797 "Cartwheel" Twopence weighed 2 ounces or 56.7 grams and was 41 mm in diameter.
Its value would depend upon which coin it was and its condition.
Please post a new, separate question with the coin's denomination.
You have a British coin ("Georgius IV D.G. Britannia Rex F.D." is abbreviated latin for "George the Fourth, King of Britain and Defender of the Faith") dated 1821. To get a value, the denomination and condition of the coin would need to be known.
This question is impossible to answer because it doesn't include a country, denomination, date, or condition.
The value of a coin marked "Georgius III D G Britanniarum Rex F D 1819" varies based on its condition, rarity, and market demand. This coin is a British silver crown featuring King George III, and its value can range from a few pounds to several hundred pounds for coins in excellent condition. For a precise valuation, it's best to consult a numismatic expert or a reputable coin dealer.
You do not specify which type of coin. In 1797, you have the following possibilities for George III British coins - Guinea - gold, about 25mm in diameter Half-Guinea - gold, about 20mm in diameter. Third-Guinea - gold, about 17mm in diameter There were no silver coins minted in 1797. Twopence - (known as a "cartwheel" coin) - copper, 41mm in diameter Penny - (known as a "cartwheel" coin) - copper, 36mm in diameter And that is about it for offically minted British coins in 1797. Due to Britains ongoing expenses with various wars in the late 18th and early 19th centuries, there were very few silver or copper coins minted, subsequently there were a great many privately minted tokens and counterfeit coins produced. Many of these tokens bear a resemblance in size and metal to the official coinage of the period.