The 1978-S Roosevelt Dime is worth anywhere from $2 in typical proof condition to over $500 for rare high-grade specimens. While most of these coins were minted for collectors, finding one in your family’s old belongings is always a thrill for hobbyists.

Condition / Grade	Estimated Value
PR 65 (Typical Proof)	$2.00 – $5.00
PR 69 Deep Cameo	$15.00 – $25.00
PR 70 Deep Cameo (Perfect)	$450.00 – $650.00

Understanding the 1978-S Roosevelt Dime

The 1978-S Roosevelt Dime is a unique piece of American numismatic history because it was never intended for general circulation. Unlike the dimes you find in your pocket change today, which were minted in Philadelphia or Denver, any dime with an “S” mint mark from 1978 was produced at the San Francisco Assay Office. These were specifically created for “Proof Sets,” which are special collections sold by the U.S. Mint to investors and enthusiasts.

If you have discovered one of these coins, you might be wondering how to verify its authenticity and grade. Using a top coin identifier app can help you distinguish between a standard business strike and a polished proof.

Modern technology like the CoinKnow app makes it incredibly easy to scan your coin and get an instant idea of what you are holding. Because these coins were handled with care by the mint, they often retain their original mirror-like luster even decades later.

The 1978-S is a “clad” coin, meaning it is composed of a copper core sandwiched between layers of cupronickel. It contains no silver, which is a common misconception among people who find shiny “S” mint coins. Despite the lack of precious metal, the value lies in the preservation and the quality of the strike.

Defining the Proof Finish and Deep Cameo

When discussing the 1978-S Roosevelt Dime, terms like “Proof” and “Cameo” are essential. A proof coin is struck using specially polished dies and planchets (the blank metal discs). This results in a background that looks like a mirror and raised details that are sharp and well-defined.

In 1978, the San Francisco mint produced over 3.1 million of these dimes. Because they were sold in protective plastic cases, many have survived in excellent condition. However, the most valuable versions are those designated as “Deep Cameo” (DCAM). This refers to a heavy contrast where the portrait of FDR appears frosty and white, while the background is a deep, dark mirror.

Collectors look for this high-contrast look because it represents the earliest strikes from a fresh set of dies. To check the latest market trends for top-tier specimens, you can view the 1978 Roosevelt Dime auction records which show how much collectors are willing to pay for perfect grades.

If your coin looks dull or scratched, it has likely been “impaired,” meaning it was removed from its set and spent as regular money. Impaired proofs are still worth more than 10 cents, but they won’t command the premium prices of a certified PR 70 coin.

Technical Specifications	Details
Composition	75% Copper, 25% Nickel over Copper Core
Weight	2.27 Grams
Diameter	17.9 mm
Edge	Reeded

Key Factors Influencing 1978-S Dime Value

What exactly makes one 1978-S dime worth $5 and another worth $500? It largely comes down to the numeric grade assigned by professional services like PCGS or NGC. A “perfect” coin is graded as 70. For a 1978-S, a PR 70 Deep Cameo is the ultimate “holy grail.”

A single tiny scratch, invisible to the naked eye but visible under a 10x magnifying glass, can drop a coin from a $500 value to a $20 value. This is why many people use the CoinKnow app to get a high-resolution zoom and preliminary assessment before spending money on professional grading fees.

The market for these coins is also influenced by “registry set” collectors. These are enthusiasts who try to build the finest possible collection of a specific series. Because many people want the “best” 1978-S for their Roosevelt Dime collection, the competition for PR 70 coins is fierce.

If you are looking for more 1978 dime value information, you will find that the San Francisco proofs generally outperform the Philadelphia (no mint mark) and Denver (D) coins of the same year, unless those business strikes are in exceptionally rare “Full Band” condition.

Are There Any Rare 1978-S Errors?

While most proof coins are inspected carefully, errors can still occur. For the 1978-S Roosevelt Dime, collectors keep an eye out for “Double Dies” or “Clipping” errors. A doubled die occurs when the die used to strike the coin has a blurred or doubled image, which is then transferred to the metal.

Another possibility is a “Repunched Mint Mark” (RPM). In the late 70s, mint marks were still hand-punched into the dies. Sometimes, the workman would strike the “S” twice, creates a slight shadow or overlapping effect. These errors are quite rare in proof sets, making them highly desirable when found.

Most “errors” reported by beginners are actually post-mint damage. If your dime looks bent, toasted, or has weird colors, it’s likely just seen some rough years in a parking lot. Professional collectors always look for “Mint Errors,” which are mistakes made during the manufacturing process itself.

Error Type	Potential Value
Double Die Obverse	$50 – $200+
Off-Center Strike	$100 – $300
Proof Strike on Wrong Planchet	$1,000+ (Extremely Rare)

Comparison: 1978-S vs. 1978 P and D Dimes

It is important to know the difference between the coins meant for your wallet and the ones meant for a velvet-lined box. In 1978, the Philadelphia mint produced over 660 million dimes, and Denver produced over 280 million. These are very common and, unless they are in perfect “Mint State” condition, they are only worth 10 cents.

The 1978-S stands out because of its low mintage of just over 3 million. While 3 million sounds like a lot, it is a tiny fraction of the total production for that year. Furthermore, the “S” mint mark is a clear indicator that the coin was intended to be a higher quality product.

Using the CoinKnow tool can help you distinguish the frosty finish of a proof from the shiny luster of a newly minted business strike. Generally, if you find a very shiny 1978 dime in circulation, check the mint mark. If it’s a “P” or “D”, it’s a common coin. If it’s an “S”, someone likely broke open a proof set to spend it!

How to Sell and Protect Your 1978-S Dime

If you believe you have a high-grade 1978-S Roosevelt Dime, the first step is to protect it. Do not clean the coin! Cleaning a proof coin will create tiny hairline scratches that ruin its value instantly. Instead, handle it only by the edges and place it in a PVC-free flip or a plastic capsule.

To get the most money for your coin, you may want to consider professional grading if the coin looks absolutely flawless. If the coin has even a minor scratch, selling it on platforms like eBay as an “unrefined” proof is often the better financial choice, as the grading fees can exceed $30.

Local coin shops are a great place for a quick appraisal, but they will likely offer you wholesale prices. For the best return, online auctions where multiple collectors can bid on the “Deep Cameo” beauty of your coin often result in the highest sale price.

FAQ

Q: Is the 1978-S dime made of silver?

A: No, the 1978-S Roosevelt Dime is a clad coin made of copper and nickel. The U.S. Mint stopped making circulating silver dimes in 1964. Special silver proof sets were not introduced until 1992.

Q: Where is the mint mark on a 1978 dime?

A: The mint mark is located just above the date on the “heads” side (obverse) of the coin. You will see a small “S”, “D”, or nothing at all (which represents Philadelphia).

Q: What is a “Full Band” dime?

A: This term applies to business strike dimes (P and D), not usually proofs. It refers to the horizontal bands on the torch on the reverse side. If the lines are clearly separated, the coin is more valuable.

Q: How can I tell if my 1978-S dime is a “Deep Cameo”?

A: A Deep Cameo dime will have a very stark contrast. The face of Roosevelt will look like it was painted with white frost, while the flat field behind him will look like a dark, polished black mirror.