Most people never pay attention to the small letters beneath the date on a coin—but they should. Those tiny mint marks tell us where a coin was made. However, when a coin that’s supposed to have a mint mark is missing one, it could mean you’re holding a rare and valuable error. While the title might mention quarters, some of the most sought-after no mint mark coins are actually dimes—specifically Roosevelt dimes that slipped through the cracks during the minting process.
Let’s take a look at three rare dimes with no mint mark that might be hiding in your change—and could be worth hundreds or even thousands of dollars.
1. 1982 No P Roosevelt Dime
In 1982, the Philadelphia Mint struck Roosevelt dimes without the “P” mintmark, which had only recently begun appearing on Philadelphia coins in 1980. A handful of these error coins were released into circulation. To the casual observer, they look completely normal—but the absence of the “P” under Roosevelt’s neck makes them rare. Depending on condition, the 1982 No P Dime can sell for $300 to over $1,000, with uncirculated versions commanding even higher prices.
2. 1968 No S Proof Roosevelt Dime
The 1968 No S Proof Dime is another major mintmark error—but this one is even rarer. It was supposed to be struck at the San Francisco Mint, which meant it should have an “S” mintmark. However, due to a die preparation error, some coins were minted without it. Since these were proof coins meant for collectors, very few were released. Today, the 1968 No S Proof Dime can fetch $10,000 to $20,000 or more, depending on the grade and demand.
3. 1975 No S Proof Roosevelt Dime
Perhaps the most famous no mint mark dime of all, the 1975 No S Proof Roosevelt Dime is one of the rarest modern coins in existence. Only a couple are known to exist, and they were created in error during the preparation of proof sets. Like the 1968 version, this coin was struck at the San Francisco Mint, where all proof coins should bear an “S.” Its absence makes this coin a modern-day treasure. One example sold for $350,000, making it one of the most expensive dimes ever.
It’s easy to overlook coins with no mint mark, especially dimes—but some of these tiny coins are worth far more than their face value. The 1982 No P, 1968 No S, and 1975 No S dimes have become legendary among collectors, and they prove that errors can lead to big rewards. If you’ve got old dimes in a drawer or coin jar, take a closer look. You could be holding a hidden treasure worth hundreds—or even hundreds of thousands—of dollars.
FAQ’s:
1. What does it mean when a coin has no mint mark?
It means the coin may have been minted in Philadelphia (which traditionally had no mark), or it could be a rare mint error, especially if it was supposed to have one.
2. How can I tell if my 1982 dime is the No P error?
Look under Roosevelt’s neck. If there’s no “P” mintmark and the coin is from 1982, it could be the valuable error coin.
3. Are proof coins supposed to have mint marks?
Yes—all modern proof coins should have a mintmark, usually “S” for San Francisco. A missing mark is likely an error.
4. How rare is the 1975 No S Proof Dime?
Extremely rare—only two verified examples are known, and one sold for $350,000.
5. Should I get these coins professionally graded?
Absolutely. Grading confirms authenticity and can dramatically increase a coin’s market value and appeal to collectors.
