The 1975-S No S Proof Dime, widely regarded as the world’s most valuable modern U.S. coin, is set to be auctioned on October 27th by GreatCollections. This highly rare coin, owned by an Ohio family for over 45 years, is one of only two known examples missing the “S” mint mark, a small but significant error that has turned it into a coveted item among collectors.
Discovery and Significance
The 1975-S No S Proof Dime was part of a proof set minted at the San Francisco Mint, which should have included an “S” mint mark on the dime. In 1975, the U.S. Mint produced 2.84 million proof sets, but only two sets without the “S” mint mark have been discovered, both by the same individual in California in the late 1970s.
These dime error coins were sold to coin dealer F.J. Vollmer and have since become legendary in the numismatic world. The Ohio family purchased their No S dime from Vollmer in 1978 for $18,200, a significant sum at the time, equivalent to nearly $90,000 today.
According to Scott Schechter and Jeff Garrett, co-authors of 100 Greatest U.S. Modern Coins, the 1975 No S Proof Dime ranks as the #1 modern U.S. coin. The coin has been graded PCGS Proof-67 and approved by CAC (Certified Acceptance Corporation) with the considerable public interest and could fetch over $500,000 at auction.
1975-S No S Auction History and Values
The 1975 No S Proof Dime auction history shows its increasing value over time. In 2011, the second known example sold for $349,600 at a Stack’s Bowers Galleries auction. In 2019, the same coin sold for $456,000 at Heritage Auctions. Shortly after, it was sold privately for $516,000 to the owner of the only complete collection of Roosevelt Dimes ever formed.
The current auction represents the first time this particular dime, owned by the Ohio family, has appeared in public sale. It is expected to attract a great deal of attention from collectors, with the current bid already reaching $250,000. The dime will be on display at the Great American Coin & Collectibles Show in Tampa, Florida, from September 11-14 before heading to the auction block in October.
What Makes the 1975-S No S Proof Dime Special?
The 1975 No S Proof Dime is significant because of its extreme rarity and the historical context of its creation. During this time, proof coins were struck with extra care for collectors, and the absence of the “S” mint mark is an unusual and highly collectible error.
Mint inspectors likely discovered this early in the first run and stopped the majority of these error dimes from being released, making the two known examples incredibly rare.
This coin stands apart from other 1975 dimes made in Philadelphia as it is a Proof coin which was only minted in San Francisco.
Collectors’ and Investors’ Interest
For collectors, the 1975 No S Proof Dime is considered a “holy grail” of modern numismatics. Its rarity, combined with the fact that only two are known to exist, drives its value. The proof coin is also in excellent condition with a Proof-67 grade, making it even more desirable.
For investors, owning a piece of modern coinage history like the 1975 No S Proof Dime can be a lucrative long-term asset. Over the years, its value has consistently appreciated, and it is expected to continue doing so due to its uniqueness.
Beware of Misleading Offers and Counterfeits
The rarity of the 1975 No S Proof Dime has led to opportunistic sellers falsely advertising common 1975 dimes as rare coins. With nearly 586 million 1975 Roosevelt Dimes produced without a mint mark, many sellers exploit the confusion between regular circulation coins and the rare proof errors. Buyers must carefully verify the authenticity and provenance of such coins, as common 1975 dimes without an “S” are not valuable.
This discovery is a reminder of how valuable certain error coins can be, especially when such a limited number of examples exist.