The 2017-S Effigy Mounds Quarter is worth anywhere from $1 in circulated condition to over $500 for high-grade specimens. Finding one of these unique coins in your pocket change might feel like winning a small lottery, especially if the coin is in pristine condition or features a rare mint strike.

Condition	Estimated Value (USD)
Circulated (Clad)	$0.25 – $1.00
Uncirculated (S-Mint Business Strike)	$2.00 – $15.00
Proof (S-Mint Clad)	$4.00 – $10.00
Silver Proof (S-Mint 90% Silver)	$15.00 – $45.00
High Grade (MS68+)	$100.00+

Understanding the 2017-S Effigy Mounds Quarter History

The 2017 Effigy Mounds National Monument quarter is the 36th release in the “America the Beautiful” (ATB) Quarters Program. This series, which began in 2010, commemorates national parks and historic sites across all 50 states and U.S. territories. If you are unsure about a coin you’ve found, using a top coin identifier app can help you distinguish between a common quarter and a rare minting.

The Effigy Mounds quarter honors the historic site located in Iowa, which preserves more than 200 prehistoric mounds built by Native Americans. The reverse design features an aerial view of mounds in the shape of a bear and a lynx, symbolic of the spiritual and cultural heritage of the area. While millions were minted in Philadelphia and Denver, the “S” mint mark quarters from San Francisco are much harder to find in circulation.

For the everyday collector, finding a 2017-S quarter is exciting because these coins were not originally intended for general circulation. Instead, they were sold in special bags and rolls directly to collectors by the Mint. Using CoinKnow can quickly tell you if your find is a standard “Business Strike” or if it carries the prestigious “S” mint mark.

The Value of the 2017-S Business Strike Quarters

Most people expect “S” mint mark coins to be proofs, but starting in 2012, the U.S. Mint began producing Circulation Quality (Business Strike) quarters at San Francisco specifically for collectors. These 2017-S Effigy Mounds quarters were sold at a premium over their face value. Today, a standard clad 2017-S quarter in a high state of preservation can command several dollars.

The current price for Effigy Mounds specimens often depends on the “Grade” or the level of wear and tear the coin has sustained. While a quarter found in a vending machine might only be worth $1, a coin kept in a protective sleeve since 2017 could be worth significantly more.

If your coin looks exceptionally shiny and lacks scratches, it might be in “Mint State” (MS). Professional graders use a 70-point scale, and a 2017-S graded at MS67 or MS68 can sell for $50 to $150. Beyond that, a near-perfect MS69 specimen is a rare trophy for any serious numismatist.

Clad Proof vs. Silver Proof: Identifying Your Coin

Two other versions of the 2017-S Effigy Mounds quarter exist: the Clad Proof and the Silver Proof. Proof coins are struck using polished dies and specially treated blanks, resulting in a mirror-like background and frosted details. If your Effigy Mounds quarter looks like a mirror, you likely have a proof.

The Clad Proof is made of the standard copper-nickel composition. However, the Silver Proof is composed of 90% silver and 10% copper. To identify a Silver Proof, look at the edge of the coin. If you see a solid silver color without a copper-colored “sandwich” line, you have found a precious metal coin. You can also check the latest 2017-S Effigy Mounds quarter value information to see how silver spot prices affect these coins.

Striking Type	Mint Mark	Metal Composition	Mintage (Estimated)
Business Strike (S)	S	Clad	914,000
Clad Proof	S	Clad	880,000
Silver Proof	S	90% Silver	570,000

How Condition and Grading Affect the Market Value

Grading is the single most important factor when determining how much your 2017-S quarter is worth. Most coins found in change are “Circulated,” meaning they have scratches, dings, or dull surfaces. These usually sell for $0.50 to $1.25 to people looking to fill holes in their albums. CoinKnow is a great tool for beginners to learn about these surface differences.

In the world of high-value auctions, “Mint State” (MS) coins are king. An MS66 may be worth $15, but just two steps up at MS68, the price jumps exponentially. This is because very few coins survive the minting and bagging process without sustaining tiny microscopic nicks.

When selling, remember that “Raw” coins (ungraded) always sell for less than “Certified” coins (graded by PCGS or NGC). However, getting a coin graded costs money, so make sure the coin is worth the investment before shipping it off to a grading service.

Rare Errors and Varieties for the 2017-S Quarter

While no “major” world-renowned errors exist specifically for the 2017-S Effigy Mounds quarter like the 1955 Double Die Penny, collectors still hunt for minor variations. These can include die chips (extra lumps of metal), doubled dies (doubling on the letters or the mounds), and “spitting eagle” style cracks.

Because the “S” mint business strikes were produced in smaller quantities (less than 1 million), the dies used to strike them are often in better condition, making errors less common but more sought after. If you spot something unusual on the lynx’s ears or the bear mounds, it could be a unique die variety.

Using a magnifying glass or a digital microscope is the best way to spot these flaws. Many collectors use CoinKnow to browse community photos of known errors to compare with their own finds. Even a small error can turn a $2 coin into a $20 hidden gem.

Error Type	What to Look For	Premium Value
Die Chip	Raised metal on the animals	+$5 – $15
Doubled Die Reverse	Doubling in the inscriptions	+$20 – $50
Off-Center Strike	Design not centered on the coin	+$100+

Collecting Tips for Everyday Americans

If you’ve just started looking at your change, the 2017-S Effigy Mounds quarter is a great “gateway” coin. It isn’t impossible to find, and it teaches you to look for the mint mark—that tiny letter “S” located to the right of George Washington’s ponytail.

Most “S” quarters found in circulation were accidentally spent by collectors or come from broken-up coin sets. To protect the value of your find, never clean your coins. Cleaning a coin with chemicals or a brush can strip away its original luster and reduce its value by 90% or more.

Store your quarters in acid-free plastic flips or cardboard holders. This prevents “toning” (discoloration) and physical damage. As time goes on, the low mintage of the 2017-S business strike quarters makes them a strong candidate for future value appreciation as more of the ATB series becomes harder to find in the wild.

FAQ

Q: Is every 2017 quarter worth more than face value?

A: No. Quarters minted in Philadelphia (P) and Denver (D) for the Effigy Mounds design were minted by the hundreds of millions. Unless they have a major error or are in perfect uncirculated condition, they are generally only worth 25 cents.

Q: Why is the S-mint mark so special?

A: Traditionally, the San Francisco Mint only produces proof coins for collectors. Finding an “S” mint mark on a regular-looking business strike quarter is rare because they were produced in very limited numbers (under 1 million) and were not released into general circulation.

Q: How can I tell if my 2017-S quarter is silver?

A: Check the weight and the edge. A clad quarter weighs 5.67 grams, while a silver quarter weighs 6.25 grams. Additionally, if the edge of the coin shows a copper stripe, it is clad. If the edge is solid silver/white, it is likely the 90% silver proof version.

Q: Where can I sell my 2017-S Effigy Mounds Quarter?

A: You can sell your coins to local coin shops, through online marketplaces like eBay, or to other collectors on specialized forums. If the coin is extremely high grade (MS68 or higher), it may be worth sending to a professional auction house.

Q: Does “damaged” mean it’s an error?

A: Not usually. Most “damage” on quarters comes from circulating in the real world (scratches from vending machines, bags, and cement). A true mint error happens during the manufacturing process, while “Post-Mint Damage” (PMD) usually decreases the coin’s value.