The 1820 sovereign of George III has a laureate head, with St. George & dragon reverse inside an inscribed garter. It was the fourth and last date of George III sovereign.
There is only one main type, but there are a number of different varieties like this on which is the open 2 variety with the large lettering. .This coin is an undergraded coin as you can see clearly the details of an MS coin.
Graded by the Numismatic Guaranty Corporation (NGC) to