A dime that had been stored in a bank vault for over 40 years was inherited by three Ohio sisters, who realized it was worth something.
But until a few years ago, they were unaware of precisely how much.
Russell, president of GreatCollections, an online currency auction company, stated that the incredibly rare coin, which was minted by the U.S. Mint in San Francisco in 1975,
fetch more than $500,000.
The missing "S" mint mark for San Francisco, one of just two known to exist, is what adds value to the dime featuring President Franklin D.
The other one went for $456,000 at an auction in 2019 and was later purchased by a private collector.
Although these two extremely rare dimes have long been known to experienced coin collectors, their whereabouts had been unknown since the late 1970s.
"They spent decades hidden." said Russell. The majority of prominent dealers and collectors have never seen one.
Russell was informed by them that their mother and brother had paid $18,200 (about $90,000 in today's money) for the first mistake coin found in 1978.