There is a theory that a threaded screw or bolt fell into the coining chamber and got struck.
Numismatist. 50 year member ANA. Winner of four ANA Heath Literary Awards; three Wayte and Olga Raymond Literary Awards; Numismatist of the Year Award 2009, and Lifetime Achievement Award 2020. Winner numerous NLG Literary Awards.
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Typical obverse die characteristic.
There is a theory that a threaded screw or bolt fell into the coining chamber and got struck.
It would be helpful if we had a picture of this anomaly...Cheers, RickO
Here are a couple shots from CoinFacts (thanks PCGS) , and a capture photo from eBay ( seller's photo)



``https://ebay.us/m/KxolR5
Very cool variety!
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Not only a spiked chin, but a spiky tongue as well! An American classic.
The spiked chin is a new variety
I really like the variety but I went a different direction for a coin for my type set. All that stuff is a bit distracting.