That coin is probably one of the highest graded proofs in the entire series, which was minted for over 50 years. That's why it is priced at $500K+.
The successor coin is even prettier, IMO.
View attachment 872926
https://www.bonhams.com/auctions/21792/lot/1315/
Sold for about half the price of the other one. But there are a lot more of these.
gatorcpa
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