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
SERIAL :5879414-001
GRADE :AU55