The 1978-S Washington Quarter is worth anywhere from $3 in typical proof condition to over $1,000 for rare, high-grade Deep Cameo specimens. While these coins were not made for general circulation, many Americans find them in inherited collections or “proof sets” and wonder if they have hit the jackpot.
| Grade/Condition | Estimated Value (USD) |
|---|---|
| PR 65 (Standard Proof) | $3.00 – $5.00 |
| PR 67 (Deep Cameo) | $10.00 – $15.00 |
| PR 69 (Near Perfect) | $25.00 – $45.00 |
| PR 70 (Perfect Grade) | $350.00 – $1,200.00 |
Understanding the 1978-S Washington Quarter
If you have discovered a shiny 1978 quarter with an “S” mint mark, you are looking at a Proof coin. Unlike the millions of quarters struck in Philadelphia or Denver for daily commerce, the San Francisco Mint produced these specifically for collectors. For a beginner collector, the easiest way to identify this coin is using the best coin identifier app, which can help you distinguish between a polished regular coin and a true proof.
The 1978-S quarter features the classic portrait of George Washington designed by John Flanagan. What makes it stand out is its mirror-like background and frosted details. In 1978, the Mint produced over 3 million of these proof sets.
Because they were sold in protective plastic cases, many have survived in excellent condition. However, if the coin has been removed from its original packaging and handled with bare fingers, oils and scratches can quickly lower its market price. If you aren’t sure about the condition, tools like CoinHix can provide instant visual comparisons to help you grade your finds accurately.
Key Features and Identification Marks
To accurately determine the value of a 1978 San Francisco quarter, you must look for specific characteristics. The “S” mint mark is located on the obverse (front) of the coin, just to the right of Washington’s ponytail.
This coin is composed of a copper-nickel clad over a pure copper core. It weighs 5.67 grams and has a diameter of 24.3 millimeters. Because it is a proof coin, the striking process involved using specially polished dies and hitting the planchet at least twice to ensure every detail of the design is sharp.
When inspecting your coin, look for the “Cameo” (CAM) or “Deep Cameo” (DCAM) effect. This is the contrast between the frosted devices (Washington’s head) and the shiny, mirror-like fields. Most 1978-S quarters fall into the Deep Cameo category, which is highly preferred by modern collectors. To verify historical auction data, you can check the latest 1978-S Washington Quarter auction prices to see what similar specimens have sold for recently.
Grading and Value Breakdown
The value of a 1978-S proof quarter is almost entirely dependent on its numerical grade on the 1-70 scale. Since these were “minted for collectors,” a grade below PR 65 is considered low and barely carries a premium over the face value.
A PR 69 Deep Cameo is a very common grade for this series. Many collectors have these in their vaults, so the price stays relatively low. However, the jump from PR 69 to PR 70 (a perfect coin) is massive. A PR 70 specimen is considered a “top pop” coin, meaning there are no better examples known to exist.
| Condition Label | Visual Description | Current Market Value |
|---|---|---|
| Imperfect Proof | Visible scratches or hazy surfaces | $1.00 – $2.50 |
| PR 68 Deep Cameo | Very attractive with tiny flaws | $15 – $20 |
| PR 70 Deep Cameo | Flawless under 5x magnification | $400+ |
High-grade coins are often certified by professional services like PCGS or NGC. If you find a perfect-looking coin, using CoinHix to compare it with professionally graded images can help you decide if it is worth the cost of professional certification.
Comparing the 1978-S to Philadelphia and Denver Quarters
It is vital to distinguish the 1978-S from its siblings minted in Philadelphia (no mint mark) or Denver (“D” mint mark). In 1978, Philadelphia minted over 521 million quarters, and Denver produced over 287 million. These are extremely common in pocket change today.
While a 1978-S is a proof and worth a few dollars, a circulated 1978 or 1978-D is generally worth only 25 cents. However, uncirculated “Mint State” versions of these business-strike coins can also be valuable if they are in pristine condition. For a comprehensive list of different versions, you can review this 1978 quarter price guide.
If you happen to find a 1978-P or 1978-D that looks like it just came off the press, it might be worth more than a standard proof. A 1978-D quarter in MS 67 condition can fetch over $100 because very few business-strike coins survived without scratches from the high-speed bins at the mint.
Errors and Variations to Look For
While 1978 wasn’t a year famous for major errors like the 1955 double die penny, there are still anomalies that can increase the value of your 1978-S Washington Quarter. Collectors are always on the hunt for “Plancthet Errors” or “Struck Through” errors.
Off-center strikes are rare but highly valuable in the proof series. Since the minting process for proofs is so strictly controlled, any proof coin that leaves the mint with an error is instantly worth a significant amount of money to error specialists.
Another thing to look for is the “Double Die Obverse” (DDO). While not as prominent as other years, slight doubling on the letters of “IN GOD WE TRUST” or the date can make a 1978-S more desirable. Using a high-magnification lens or the zoom features on CoinHix can help you spot these tiny mechanical errors that the naked eye might miss.
Is Your 1978-S Quarter Worth Grading?
One of the most common questions beginners ask is, “Should I send my coin to PCGS?” For the 1978-S quarter, the answer is usually “no” unless the coin is absolutely perfect. The cost of grading often exceeds $30-$50 per coin including shipping.
As shown in the pricing tables, a 1978-S is only worth substantial money if it reaches the PR 70 grade. If your coin has even a single microscopic hairline scratch, it will likely grade as a PR 68 or PR 69, making it a $10 to $20 coin. In that case, you would lose money by paying for professional grading.
| Decision Factor | Action Recommended |
|---|---|
| Visible scratches | Keep in a protective flip; do not grade. |
| Perfect mirror/frosting | Consider grading if you think it’s a PR 70. |
| Found in pocket change | Spend it or keep as a curiosity; likely low value. |
Conclusion
The 1978-S Washington Quarter is a beautiful piece of American minting history. While most are worth only a few dollars, finding a flawless PR 70 Deep Cameo can be a true payday. Always handle your coins by the edges, store them in PVC-free holders, and use digital tools to stay updated on current market trends. Whether you are a casual hobbyist or a dedicated collector, knowing the nuances of proof coins adds a whole new level of excitement to the hunt!
FAQ
Q: Why does my 1978-S quarter look different from my other quarters?
A: The “S” signifies it is a proof coin minted in San Francisco. These coins are struck twice with special polished dies, giving them a mirror-like finish and frosted details that regular quarters don’t have.
Q: Can I find a 1978-S quarter in my change?
A: It is rare, but it happens. These “impaired proofs” usually end up in circulation when someone accidentally spends a collection. Once they are scratched by other coins in a cash register, their value drops significantly.
Q: How much silver is in a 1978-S quarter?
A: None. The U.S. Mint stopped using silver for quarters in 1964 (with the exception of some 1776-1976 Bicentennial sets). The 1978-S is a clad coin made of copper and nickel.
Q: What is the highest price ever paid for a 1978-S quarter?
A: In recent years, PR 70 Deep Cameo examples have sold at major auctions for prices ranging from $600 to over $1,000 depending on the auction house and current demand.