Rare 1975 Dime Without Mint Mark Sells for Over $500,000

Three Ohio sisters auctioned a unique 'no S' proof dime, one of only two known, after inheriting it from their late brother.

• The coin was minted in San Francisco in 1975 and is missing the 'S' mint mark, making it a modern rarity.
• The sisters' family originally purchased the coin in 1978 for $18,200, which is roughly equivalent to $90,000 today.
• The dime was sold through GreatCollections, an auction house specializing in valuable currency, for $506,250.
• Only one other 1975 'no S' proof dime is known to exist, which sold for $456,000 in 2019 and later resold for $516,000.
• The sisters, who wish to remain anonymous, kept the coin as a financial safety net, stored in a bank vault for over 40 years.

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