1970-S Washington Quarter Value: Guide to Rare Proof Coins
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The 1970-S Washington Quarter is worth anywhere from $1 in circulated proof condition to over $2,500 for rare mint errors or high-grade specimens. While most found in change are common, certain unique varieties from the San Francisco Mint carry significant premiums for collectors today.
| Condition / Grade | Estimated Value |
|---|---|
| PR63 (Typical Proof) | $1.00 – $3.00 |
| PR67 Cameo | $10.00 – $15.00 |
| PR69 Deep Cameo | $40.00 – $60.00 |
| PR70 Deep Cameo | $400.00+ |
| 1970-S Over 1900 Canadian Quarter Error | $2,000.00 – $3,000.00 |
Why the 1970-S Washington Quarter is Unique
If you have discovered a 1970 quarter with an “S” mint mark, you have found something slightly different from your everyday pocket change. In 1970, the San Francisco Mint was responsible for producing proof sets—coins specially struck for collectors with a high-shine, mirror-like finish. Unlike the P and D quarters meant for grocery stores, these were originally sold in protective plastic cases.
If you are unsure whether your coin is a proof or an error, using a top coin identifier and value app can help you distinguish between a standard strike and a rare variety. Most “S” marked quarters found in circulation today are “impaired proofs,” meaning they were removed from their sets and used as regular money. While these are neat finds, they usually only command a small premium over face value.
The real excitement lies in the high-grade Deep Cameo versions and the legendary mint errors. Collectors pay high prices for coins that exhibit a sharp contrast between the frosted portrait of George Washington and the polished fields. To get an accurate reading on your specific coin, the CoinKnow app offers helpful visual guides to help you determine if your quarter has the “eye appeal” required for a high-value sale.
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Evaluating the 1970-S Quarter Value by Grade
When assessing the 1970-S Washington Quarter value, condition is everything. Because these were never intended for circulation, “grading” is based on how well the proof finish has been preserved. Hairlines from cleaning or scratches from being tossed in a jar will significantly lower the price. Professional grading services like PCGS or NGC are the gold standard for verifying these values.
Most 1970-S quarters fall into the PR65 to PR67 range. However, if you possess a flawless specimen, the current value for high-grade 1970 quarters can jump dramatically once you reach the PR69 or PR70 tiers. A PR70 Deep Cameo (DCAM) is essentially perfect, appearing just as it did the moment it left the die in San Francisco.
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| Grade Designation | Visual Characteristics | Value Range |
|---|---|---|
| Proof (Standard) | Mirror luster but no frosting on the design. | $1 – $5 |
| Cameo (CAM) | Light frosted look on Washington’s head. | $8 – $20 |
| Deep Cameo (DCAM) | Heavily frosted design against black mirrors. | $50 – $2,500+ |
The Incredible 1970-S Over 1900 Canada Quarter Error
The 1970-S Washington Quarter is famous in the numismatic world for one of the most bizarre errors in US history. A small number of these coins were accidentally struck over 1900-dated Canadian Silver Quarters. This wasn’t a simple double die error; it was a foreign coin that somehow made its way into the San Francisco Mint’s machinery.
If you have one of these, the comprehensive 1970-S error price list shows that these can sell for upwards of $35,000 at major auctions. To spot this, look for faint underlying details from the Canadian design, specifically near the “1900” date or the Canadian portrait that might peek through Washington’s image.
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Because this error is so rare, many fakes exist. Using CoinKnow allows you to compare your coin against verified high-resolution images of known error coins. This step is crucial before spending money on professional authentication. If you see “1900” on a 1970 quarter, you aren’t seeing things—you might be looking at a small fortune.
The Difference Between Cameo and Deep Cameo
For beginners, the terms “Cameo” and “Deep Cameo” can be confusing. When the San Francisco Mint produces proof quarters, the dies are polished to a high shine, and the recessed parts are sandblasted to create a frosted appearance. The first few hundred coins struck with a new die have a stark, beautiful contrast. These are the ones collectors crave.
As more coins are struck, the frost wears down. A “Cameo” has some frosting remaining, while a standard “Proof” looks shiny all over. A “Deep Cameo” (or Ultra Cameo) looks like a portrait appearing out of a black pool of water. These DCAM 1970-S quarters are the ones that reach the hundred-dollar or thousand-dollar mark.
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| Condition Factor | Impact on Value |
|---|---|
| Scratches / Hairlines | Reduces value to silver melt or face value. |
| Heavy Frosting | Increases value by 5x to 10x. |
| Perfect PR70 Grade | Can reach over $500 for non-errors. |
How to Identify a 1970-S Quarter in Your Change
Finding a 1970-S quarter in your pocket change is possible, though rare. Usually, these coins end up in circulation because someone broke open a family proof set to spend it, or a thief spent a stolen collection. To identify it, flip the coin to the front (obverse) and look to the right of George Washington’s ponytail. You will see a small “S” mint mark.
If the coin looks much shinier than a regular quarter but is covered in small scratches, it is likely an “impaired proof.” These are worth about $1.00 to $2.00 to a casual collector. However, if the coin is pristine and you can see your reflection clearly in the background, you should handle it only by the edges and place it in a protective flip immediately.
For those who are just starting their coin-hunting journey, having a mobile resource like CoinKnow helps identify mint marks and potential errors instantly. It’s a great way to ensure you don’t accidentally spend a coin worth $50 at the vending machine.
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Market Trends for Washington Quarters
The market for Washington quarters has remained steady, with a slight uptick in interest for 1970s-era proof coins. While many people focus on the silver quarters from 1964 and earlier, the 1970-S is a favorite among “Date and Mint” set collectors. These collectors want a perfect example from every year, which creates competition for the high-grade PR69 and PR70 coins.
Because the 1970-S is a clad coin (composed of copper and nickel, not silver), its value isn’t tied to the price of precious metals. Its value is purely based on rarity and demand. This makes it a “numismatic” coin, where its worth comes from its history and condition rather than its weight in metal.
Check the edges of your coin. If you see a copper stripe, it’s a standard clad proof. If the edge is solid silver, you might have found another rare error where a 1970 quarter was struck on a silver planchet intended for a different coin. This is one of the many reasons why checking your change can be so rewarding!
FAQ
Q: Is the 1970-S quarter made of silver?
A: No, standard 1970-S proof quarters are clad, meaning they are made of a copper-nickel alloy. However, rare errors exist where the design was struck on 80% silver Canadian planchets. A standard 1970-S quarter will show a brown/copper stripe on the edge.
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Q: What makes the 1970-S Washington Quarter rare?
A: The standard proof is not rare, with over 2.6 million minted. What is rare are coins that achieve a PR70 grade, coins with “Deep Cameo” frosting, and the famous “1970-S over 1900 Canada” error strike.
Q: How much should I pay for a 1970-S quarter?
A: For a basic proof for your collection, you should expect to pay between $2 and $5 at a local coin shop. You should only pay high prices (over $50) if the coin is professionally graded by PCGS or NGC as a high-tier Deep Cameo specimen.
Q: Where can I sell my 1970-S quarter?
A: If it is a common proof, eBay or a local coin shop are your best bets. If you believe you have the rare Canadian error or a PR70 grade coin, you should contact a major auction house like Heritage Auctions or GreatCollections to maximize your return.
