Initially, there were only 14,485 of these coins when they were originally minted. However, there are approximately only 100 or so survivors left in all grades combined. Despite the rarity of this date, it is relatively common when compared to other half eagles from the 1820s. In fact, it is the most available date between 1821 and 1829.
This variety is known as the Large 8, 13 stars reverse. As you can see, the 8 appears larger than the rest of the numbers. If one looks at the reverse, they will find 13 stars, which is expected on these coins. However, there is also a 14-star variation. These stars were not meant to represent the states, as there were already 15 states at this time. Simply, the engraver added an additional star by accident when creating the die. So, with a mintage of 24,867, the Large 8, 13-star reverse is the more common variety. Typically, one sees this coin available in VF grades with uncirculated examples only being occasionally available.
On the other hand, the gold eagle will only have a mintage of 1,945. This of course is symbolic of the year that World War II ended. However, this is also the lowest mintage of any U.S. Mint numismatic product ever. This extremely low mintage combined with the fact that this is the final coin of the final year of this design means that this coin will sell out within mere seconds. The best bet with an item like this is to try to place an order online. It is possible that a portion of the coins could be allocated to telephone sales, but there is no guarantee. In addition, with the current pandemic, there would be no phone sales. However, that could change by the time this coin is released.
If you didn't already know, 2020 will be the last year of the reverse design of the American Silver Eagle and American Gold Eagle. Both are memorable designs and have been in use since the coins' inception in 1986. Legendary designer, John Mercanti became one of the most popular coin designers/engravers due to his work being featured on the back of all silver eagles for 30+ years.
There are two varieties for this example, Large D and Medium D. The best way to differentiate is to see if the mint mark is wider or taller. If it is wider, than it is most likely a medium example. If it is the latter, then it is most likely a large example.