1918-S Mercury Dime Value What This San Francisco Coin Is Really Worth
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The 1918-S Mercury Dime is worth anywhere from $4 to $8 in heavily worn condition, but well-preserved examples can fetch $30 to $100 or more — and top-grade mint state coins have sold for several hundred dollars at auction. If you found one of these old dimes in a coin jar or inherited collection, you may be sitting on something genuinely valuable.
What Makes the 1918-S Mercury Dime Special
The 1918-S Mercury Dime was struck at the San Francisco Mint during World War I, a time when American coin designs were going through a remarkable artistic transformation. This dime features the iconic “Winged Liberty Head” design by Adolph Weinman — often called the Mercury dime because the winged cap resembles the Roman god Mercury. It’s one of the most beautiful dimes ever made by the U.S. Mint.
The “S” mintmark on this coin identifies it as a San Francisco issue. In 1918, the San Francisco Mint produced approximately 34,000,000 of these dimes — a reasonably large mintage, which is part of why circulated examples are still findable today. However, finding one in truly nice condition is another story entirely.
If you’re not sure what you have, using a coin identifier and value app can help you quickly confirm the mintmark, date, and estimated grade before you do anything else with the coin.
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How Much Is the 1918-S Mercury Dime Worth by Grade
Coin value depends heavily on condition, and Mercury dimes are no exception. A coin that has been well-circulated will show flattening on the bands of the fasces on the reverse — a detail that experienced collectors pay close attention to. These bands are called “Full Bands” (FB), and coins with sharp, fully separated bands carry a significant premium.
Here’s a general value breakdown for the 1918-S Mercury Dime:
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| Grade | Description | Estimated Value |
|---|---|---|
| Good (G-4) | Heavy wear, date visible | $4 – $6 |
| Fine (F-12) | Moderate wear, details visible | $7 – $12 |
| Extremely Fine (EF-40) | Light wear on high points | $20 – $35 |
| About Uncirculated (AU-55) | Slight wear, mostly sharp | $40 – $65 |
| Mint State (MS-63) | No wear, some bag marks | $80 – $150 |
| Mint State FB (MS-65 FB) | Full Bands, gem quality | $300 – $700+ |
For the most current auction results and certified coin prices, you can browse detailed 1918-S Mercury Dime price data in mint state grades to see what collectors are actually paying right now.
Silver Content and Melt Value
One thing every 1918-S Mercury Dime owner should know: this coin is made of 90% silver. Each dime contains about 0.07234 troy ounces of pure silver. That means even a heavily worn example has real metal value beyond its numismatic worth.
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With silver prices fluctuating around $28–$32 per troy ounce (as of recent market levels), the melt value of a single Mercury dime sits at roughly $2.00 to $2.30. In most grades, however, the collector value far exceeds the silver melt value — so don’t melt these coins down.
The silver content is a built-in floor for value, which is reassuring if your coin is in rough shape. You’re always getting at least the metal value, plus a collector premium on top.
How to Check Your Coin’s Condition at Home
Before you take your 1918-S dime to a dealer or submit it for grading, it’s worth doing a basic evaluation yourself. Look at the coin under good lighting — natural daylight or a small LED lamp works well. Focus on the high points of the design: Liberty’s cheek, the feathers on the cap, and the bands on the fasces on the reverse.
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If the bands on the fasces (the bundle of sticks) appear sharp and clearly separated into two sections, you may have a Full Bands coin, which commands a serious premium. If they look flat or merged together, it’s a standard example.
CoinKnow is a great tool for this kind of home evaluation. It uses your phone’s camera to analyze coin condition and give you an instant grade estimate — no expertise required. Many casual collectors have been surprised to discover their coins were worth significantly more than they thought.
You can also check out a complete breakdown of 1918 dime values across all mint marks and grades to compare your 1918-S against the Philadelphia and Denver issues from the same year.
Your Old Coin Could Be Valuable!
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Should You Clean or Sell Your 1918-S Mercury Dime
This is one of the most common mistakes new collectors make: cleaning old coins. Never clean a Mercury dime or any collectible coin. Cleaning removes the natural patina (called “toning”) that develops over decades, and it permanently damages the surface in ways that graders can detect immediately. A cleaned coin can lose 50% or more of its value.
If you’re thinking about selling, your options include local coin dealers, coin shows, eBay, and professional auction houses for higher-grade examples. For everyday worn pieces, a dealer will likely offer you close to silver melt value or slightly above. For nicer coins in EF or better condition, it pays to get multiple offers.
CoinKnow can also help you understand what similar coins have sold for recently, so you walk into any negotiation knowing what your coin is actually worth.
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Your Old Coin Could Be Valuable!
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FAQ
Q: How can I tell if my Mercury dime is the 1918-S and not a different year or mint?
A: Look at the date on the front of the coin — it should clearly read “1918.” Then flip it over and look just above the “E” in “ONE” on the left side of the coin near the rim. A small “S” mintmark there confirms it was made in San Francisco.
Q: Is the 1918-S Mercury Dime rare?
A: Not in circulated grades — over 34 million were minted, and many survived. However, finding one in high uncirculated condition, especially with Full Bands, is genuinely rare and desirable to collectors.
Q: What’s the best way to get an accurate value for my 1918-S dime?
A: Start by assessing the condition yourself, then cross-reference recent auction sales online. For a fast and reliable estimate, CoinKnow lets you scan your coin and get an instant value based on real market data — it’s one of the easiest ways to get a solid starting point before you sell.