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UNIQUE GOLD BUFFALO NICKEL
As amazing as it sounds, this is a 1913 Buffalo Nickel struck on a U.S. $5 Gold planchet. This unique discovery surfaced in 2019 and was previously unknown to the numismatic community.
Struck during the era of the five known world famous 1913 Liberty Head Nickels valued at millions each, this unique Gold Buffalo Nickel is either a mint error or a piece de caprice. It was likely made for a Mint official or a famous numismatist. It also could have been struck for presentation purposes but is not listed in Judd as a pattern.
The only comparable U.S. coins struck in gold, and not in their official adopted medals (copper, nickel, silver) are the following:
(6) known Indian Head Cents struck on $2½ gold planchets. Two of these sold in public auction for $253k and $276k, and I personally sold one at $300k. These are well documented with famous pedigrees. The 1900 in MS 65 PCGS that I sold for 300k was formerly in the collections of B.G. Johnson and Colonel Green.