In the world of coin collecting, a small error can lead to a massive fortune. A 1975 dime, one of only two known to exist without the San Francisco Mint’s “S” mark, has emerged from a bank vault after 46 years to fetch an astonishing $506,250 at auction. This unassuming coin, which looks ordinary at first glance, has been hailed as the “grail of modern coins” and set a new auction record, captivating collectors worldwide.
Minted in 1975 at the U.S. Mint in San Francisco, this dime was part of 2.8 million proof sets created exclusively for collectors, each bearing the “S” mint mark to signify its origin. However, a rare mistake left at least two dimes without this mark, making them extraordinary rarities. The coin, featuring Franklin D. Roosevelt’s portrait and the year 1975, lacks the small “S” typically found above the date—a detail that transforms it into one of the rarest modern U.S. coins.
“This is the holy grail of modern coin collecting,” said Ian Russell, president of GreatCollections, the auction house that facilitated the sale. “All 1975 proof dimes should have the ‘S’ mark. The absence of it makes this coin exceptionally rare—only two have ever been discovered.”
The dime’s absence from prestigious collections, including those of the Smithsonian, the American Numismatic Society, and the American Numismatic Association, further elevates its status. Its scarcity and historical significance sparked a bidding frenzy, with over 200 bids from collectors in the U.S., Germany, Japan, and the U.K., culminating in a record-breaking sale.
The story of this dime began in 1977, when a California collector noticed the missing “S” on two dimes from a set of five proof sets ordered by mail. These coins were sold to a Chicago-based dealer, F.J. Vollmer & Company, and then dispersed. One of the dimes resurfaced in 2011, selling for $349,600, and again in 2019 for $456,000. The other, however, vanished into obscurity—until 2017.
That year, Russell received a cryptic call from an Ohio man who, after months of cautious conversations, revealed he owned the missing dime. He and his mother had purchased it decades earlier and safeguarded it in a bank vault for 46 years, known only to a handful of trusted confidants. “He was relieved to finally share the secret,” Russell recalled. “We spoke regularly about coins, but this dime was his prized possession.”
Tragically, the collector passed away earlier this year, leaving the dime to his three sisters. He had always considered it a family asset, intending for his sisters to benefit from its value. “They knew it was special, but had no idea it was worth half a million dollars,” Russell said. “That’s the price of a luxurious home. He was generous, wanting his family to enjoy the proceeds.”
The auction, conducted by GreatCollections, drew over 400 unique bidders tracking the coin’s sale. After intense competition, it was acquired by a long-time client who plans to keep it in his family for decades, mirroring the previous owner’s stewardship. “The buyer appreciates rarities that rarely come to market,” GreatCollections noted. “His goal is to preserve it for the next 46 years.”
This 1975 dime, born from a minting error, has transcended its 10-cent face value to become a symbol of rarity, legacy, and the thrill of discovery. From a San Francisco mint to an Ohio vault, and now into the hands of a new collector, its journey underscores the enduring allure of coin collecting—where a tiny mistake can rewrite history and spark a fortune.