Just watch. It's going to be something like AU55-58 'cleaned' or something. I said MS62 cause that was first impression and I've 2nd guessed bad before. Apart from those 3 major areas-- obverse behind neck, obv front of mouth, and rev rim I think the others could be justified as bag/mint marks and an MS grade business strike. ...But gold is not my forté either. Fun post though. Side note: Gold spot price is up. Great time to flip a coin like this and grab a new set of 2020s if excess funds are there. The new 2020 full four piece mint sets are up to $4040 a pop based on yesterday's quote and initial offering. When I looked last year it was maybe 3600? Beautiful date+design combination. Only thing is if it's overminted then long term value is meh. If funds were there for gold sets I would pick one up. ...but I digress. Gotta give the OP's example credit because it has passed through more economic dips than the new set. Plus a retraction of the gold standard and two world wars and it is still in coin form.
I bought an 1895 $10 Liberty quite a while ago. I had just started collecting coins although I had a pretty good collection my father willed me. A lot of silver, no gold tho. I went to a dealer for information. I wanted to look at some gold coins. He had just bought a few from others. I bought the 1895 $10 Liberty for about $800. I bought a 1904 $20 Liberty raw for about $1,300. I had both of them graded by NGC. The dealer took it to a coin show and had both of them graded. The $10 came back MS 61, the $20 came back UNC DETAILS-Obverse Scratched. I can look at the Red Book to get an idea of the $10, but don't know how to price the $20. I bought another gold coin already graded by PCGS. It is the 2009 Ultra High Relief Gold Double Eagle Coin graded MS 68. Not a great grade, but I liked the coin. I bought it for about $1,300 as well. It came with the original wood box and pamphlet, sealed.