At first glance, the 1945 Mercury dime may look like just another silver coin from World War II-era America. But eagle-eyed collectors know that one small detail can turn this common coin into a rare and valuable treasure. That detail? A tiny mintmark—the Micro S. While millions of dimes were minted in 1945, only a small percentage came from the San Francisco Mint with a miniature “S” mintmark. Known as the 1945 Micro S Mercury Dime, this variety has fascinated collectors for decades due to its subtle difference, scarcity in higher grades, and increasing demand. If you’ve ever sifted through old coins or inherited a coin collection, this is one small coin worth a big look.
The Coin: 1945 Micro S Mercury Dime
The Mercury dime—officially called the Winged Liberty Head dime—was designed by sculptor Adolph A. Weinman and minted from 1916 to 1945. The coin gets its nickname from the obverse design, which features Lady Liberty wearing a winged cap that resembles the Roman god Mercury. In 1945, the final year of the series, over 159 million dimes were struck. Most were routine issues, but a small group from the San Francisco Mint stood out: instead of the normal-size “S” mintmark, these dimes were struck with a much smaller “S”, believed to have come from a worn or altered mintmark punch. This mintmark variety, known as the Micro S, appears lower and closer to the rim, and it’s clearly smaller than the standard “S” seen on other 1945 dimes. It was likely a die preparation error—one that escaped the mint’s attention and was only discovered by collectors years later.
Why It Matters
The Micro S isn’t just a curiosity—it’s a recognized variety listed in major coin catalogs, such as the Red Book and certified by grading services like PCGS and NGC. While circulated examples are fairly affordable, high-grade uncirculated pieces, especially with Full Bands (well-defined horizontal lines on the torch on the reverse), are much rarer and command significant premiums.
- A standard 1945-S dime in average circulated condition might fetch $2–$5, based on silver content.
- A 1945 Micro S dime in the same grade can bring $20–$50.
- In Mint State with Full Bands, values can soar to $1,000+, especially in grades like MS66 or higher.
Spotting the Micro S takes a sharp eye or magnification, but it can pay off big—especially if you happen upon one in a forgotten coin roll or family collection.
The 1945 Micro S Mercury Dime proves that in numismatics, tiny details can lead to big discoveries. This small variation—nearly invisible to the casual observer—has earned its place in the hearts (and collections) of U.S. coin enthusiasts. Whether you’re a seasoned collector or just getting started, the Micro S is one dime that makes a major impact. If you ever find a 1945 dime with an unusually small “S” mintmark, take a closer look. That tiny “S” could turn ten cents into a small fortune.
FAQ’s:
1. What exactly is the Micro S mintmark?
It’s a smaller-than-normal “S” mintmark found on some 1945 dimes from the San Francisco Mint. The mintmark appears lower and closer to the rim than the regular “S.”
2. How can I tell if my dime is a Micro S?
Use a magnifying glass. Compare the mintmark to photos of regular 1945-S dimes. The Micro S is clearly smaller and in a different position.
3. Is the Micro S considered an error or a variety?
It’s considered a variety, not an error. It was likely caused by the use of a different or worn mintmark punch.
4. How much is a 1945 Micro S dime worth?
Value varies by condition. Circulated examples may bring $20–$50, while uncirculated, Full Bands specimens can exceed $1,000 at auction.
5. Should I get mine graded?
If your coin is in good shape and shows signs of being the Micro S, it’s worth submitting to a professional grading service like PCGS or NGC for authentication and value verification.
