The "No Arrows" dime went to an anonymous buyer in the auction at the Pennsylvania Convention Center in Philadelphia, KYW News Radio reported.
It was described as the world's most valuable dime.
Coin Update News said the dime was probably sent to Philadelphia for assay and was supposed to be melted down along with others in the series because the weight of silver in dimes had been slightly increased. But someone presumably took it home for a souvenir and it resurfaced decades later in a private collection.
The dime's most recent home was in the Battle Born collection at the World's Fair of Money. The Battle Born collection included a sample of every coin minted in Carson City until the operation was shut down in 1893.