The 1970 S Roosevelt Dime is worth anywhere from its face value of $0.10 in circulated condition to over $35 for high-quality proof specimens. While you might not find a fortune in your pocket change, these San Francisco minted coins hold a special place in many American collections.
Understanding the San Francisco Minted 1970 S Dime
If you have found a dime dated 1970 with a small “S” mint mark near the date, you are looking at a coin produced at the San Francisco Assay Office. Unlike the Philadelphia or Denver dimes of that year, which were made for general circulation, the 1970-S was exclusively produced as a Proof coin. This means it was struck using specially polished dies and planchets to create a mirror-like finish intended for collectors.
Because these were sold in official sets, finding one in your spare change is quite rare. If you do find one, it likely escaped from a broken collection. To quickly determine if your find is a genuine proof or a common business strike, you can use a free coin identifier app to analyze the luster and strike quality. These digital tools, like the CoinHix app, are perfect for everyday people who aren’t professional numismatists.
How Construction and Condition Impacts 1970 S Dime Value
The value of your 1970-S dime depends almost entirely on its physical condition and whether it has developed “Cameo” contrast. A Cameo coin features a frosted portrait of Roosevelt that stands out sharply against a deep, watery mirror background. These are highly prized and command a premium over standard proofs.
Even though millions of these sets were produced, many have been damaged by humidity or improper handling over the decades. A coin that has been scratched or cleaned will drop significantly in price. Professional graders look for “Deep Cameo” (DCAM) designations which represent the pinnacle of minting quality. For a closer look at the market premium for high-grade specimens, checking the 1970 Roosevelt Dime market prices for top grades can help you see why quality matters.
Current Market Prices for 1970 S Roosevelt Dimes
For most people, a 1970-S dime found in a drawer is worth between $2 and $5. However, if the coin is still in its original US Mint plastic packaging, it retains more value. The market for these coins is stable, as they are essential for anyone trying to complete a full set of Roosevelt Dimes from the 1970s.
Below is a breakdown of what you can expect in terms of value based on the specific type of finish and the coin’s overall grade. Remember that most “found” coins will fall into the lower end of this spectrum unless they have been exceptionally well-preserved.
| Coin Condition/Grade | Estimated Value (USD) |
|---|---|
| Circulated (Average Wear) | $0.10 – $0.25 |
| Proof PR65 (Typical Quality) | $2.00 – $4.00 |
| Proof PR69 (Near Perfect) | $12.00 – $20.00 |
| Deep Cameo (High Contrast) | $35.00+ |
Identifying Rare Errors and Varieties in 1970 Dimes
While the 1970-S is most common as a proof, collectors also keep an eye out for the 1970-D and 1970-P (no mint mark) versions. While these were struck by the hundreds of millions for daily use, specific errors can make them valuable. Common errors includes “off-center strikes” or “double dies” where the letters or date appear to have a ghost-like secondary image.
If you suspect your coin has a unique flaw, you should compare it against known error catalogs. You can find comprehensive 1970 Roosevelt Dime worth and variety details online to see if your coin matches any documented rarities. Using an app like CoinHix can also help you zoom in on these tiny details that are often invisible to the naked eye.
Maintaining the Value of Your Coin Collection
If you discover you have a 1970 S Roosevelt Dime in good condition, the most important thing you can do is avoid cleaning it. Many beginners make the mistake of using silver polish or soap to make the coin “shiny,” but this actually destroys the coin’s numismatic value by leaving microscopic scratches on the surface.
Instead, store your dime in a PVC-free plastic flip or a coin album. This prevents “milk spots”—cloudy white stains that often form on older proof coins due to environmental exposure. By preserving the original mint luster, you ensure that your coin remains a liquid asset should you ever decide to sell it. To stay updated on how your collection’s value changes over time, many hobbyists rely on the CoinHix app for real-time price tracking and collection management.
Frequently Asked Questions
Q: Is a 1970 S Roosevelt Dime made of silver?
A: No. By 1970, the US Mint had transitioned to a “clad” composition. The 1970-S dime is made of a core of pure copper bonded to outer layers of a copper-nickel alloy. Only dimes minted in 1964 and earlier contain 90% silver.
Q: Why is there an “S” on my dime but it looks like a normal coin?
A: In 1970, the San Francisco Mint only produced Proof coins. If your “S” dime looks dull or scratched, it was likely part of a Proof Set that was broken open and spent by someone, causing it to wear down just like a regular nickel or penny.
Q: How can I tell if my 1970-S dime is a “Deep Cameo”?
A: A Deep Cameo (DCAM) coin will have a very strong contrast. The portrait of President Roosevelt will look white and frosted (like a chalkboard), while the background fields will look like a black mirror. If the background looks “foggy,” it is likely a standard proof.
