A tiny missing letter could make a huge difference in your wallet. We’re talking about “No-S” dimes—coins that were minted without the “S” mintmark indicating they were struck at the San Francisco Mint. Normally, proof coins from San Francisco carry this “S,” but in rare instances, the mintmark was accidentally left off the die, creating highly collectible and valuable error coins. These mistakes are few and far between, but they’ve become treasured finds worth thousands of dollars. If you’ve ever purchased a proof set or inherited old coins, you could unknowingly own one of these rare No-S dimes.
1. 1968 No-S Roosevelt Dime (Proof)
The 1968 No-S Roosevelt Dime was the first of this rare error type. Intended to be included in special proof sets, this dime was accidentally struck without the “S” mintmark. Only a few dozen examples are known to exist, making it one of the rarest modern proof errors. Because it was never meant for circulation, these dimes are only found in proof sets—and spotting one is like striking gold. One example sold for over $45,000 at auction, and demand for this coin remains high among serious collectors.
2. 1970 No-S Roosevelt Dime (Proof)
Another valuable mistake came just two years later: the 1970 No-S Roosevelt Dime. Like the 1968 version, this coin was struck for proof sets but lacked the “S” mintmark. Its rarity and the fact that it comes from a decade known for few major coin errors makes it highly sought-after. These coins have been known to sell for $500 to $3,000 depending on their condition and whether they are graded by a professional service like PCGS or NGC. They are a perfect example of how subtle minting errors can be extremely valuable.
3. 1983 No-S Roosevelt Dime (Proof)
The 1983 No-S Roosevelt Dime is one of the more recent and better-known No-S errors. It occurred when a proof die meant to carry the “S” mintmark was left blank, resulting in a limited number of dimes released without it. These coins were once believed to be destroyed or caught before reaching the public—but a few slipped through. They now sell for $1,000 to $5,000, and examples in pristine condition with cameo or deep cameo finishes are worth even more. They serve as a reminder that even relatively modern coins can hold huge value.
Who would think that a missing letter could be worth thousands of dollars? The 1968, 1970, and 1983 No-S Roosevelt Dimes prove that even minor minting oversights can result in major paydays. These coins are usually found in proof sets, not circulation, so if you’ve got sealed U.S. Mint proof sets from these years, it’s time to take a closer look. One of these little mistakes might just make you rich overnight.
FAQ’s:
1. What does “No-S” mean on a dime?
It means the coin lacks the “S” mintmark that normally identifies it as minted in San Francisco—often due to a minting error.
2. How can I tell if my dime is a No-S error?
Check the obverse (front) of the coin, under the date. If there’s no mintmark in a proof coin from San Francisco, it could be rare.
3. Are No-S dimes found in circulation?
No, they were only issued in proof sets, so you’re unlikely to find one in everyday change.
4. Should I open old proof sets to check?
Yes, carefully inspect the coins. If you spot a missing mintmark, consider having the coin graded professionally.
5. Are No-S dimes still being discovered?
Yes, occasionally. Some collectors are just now finding them in unopened or forgotten proof sets from decades ago.
