To most people, a quarter is just 25 cents. But for coin collectors, certain quarters are worth examining under a magnifying glass—because a rare mint error can turn an ordinary coin into one worth hundreds or even thousands of dollars. These valuable mistakes often go unnoticed in circulation, yet they’re among the most prized finds for numismatists. From misstrikes to missing mintmarks, the right error on the right quarter can mean a serious payday. Here are three rare quarters you should know about—each with a specific error that could make it a small fortune.
1. 2004-D Wisconsin State Quarter (Extra Leaf Error)
The 2004 Wisconsin State Quarter has become legendary among collectors thanks to an odd-looking flaw: an extra leaf on the ear of corn depicted on the coin’s reverse. There are two known variations—the “extra high leaf” and the “extra low leaf”—both believed to be the result of intentional or accidental die modifications during the minting process. These coins were only produced at the Denver Mint and slipped into circulation unnoticed at first. Today, depending on condition, the extra leaf Wisconsin quarter can sell for $300 to over $1,000, with some near-mint examples going even higher.
2. 1970-S Washington Quarter Struck on a Canadian Coin
One of the most bizarre and valuable quarter errors ever found is the 1970-S Washington quarter that was accidentally struck on a 1941 Canadian silver quarter planchet. This means a U.S. coin was minted on a blank meant for a foreign currency—a rare and highly collectible mistake. It weighs slightly less than a normal quarter and has visible remnants of the Canadian design underneath the U.S. strike. One example sold for over $35,000 at auction. While extremely rare, this type of wrong planchet error reminds collectors to always check weight and surface details.
3. 1999-P Delaware Quarter (Spitting Horse Error)
The first coin in the 50 State Quarters program, the 1999-P Delaware quarter, became famous for a quirky error known as the “spitting horse.” This happens when a die crack appears on the coin, creating the illusion that the horse (Caesar Rodney’s horse) is spitting. Though minor, this die break makes the coin a favorite among error hunters. These quarters typically sell for $20 to $250, but perfect examples in uncirculated condition or certified by PCGS or NGC can command much more.
Mint errors aren’t just manufacturing mistakes—they’re hidden opportunities. From extra leaves on Wisconsin corn to foreign planchets and tiny die cracks, these rare error quarters prove that not all coins are created equal. If you come across one of these odd-looking coins, don’t spend it—you might be holding a valuable piece of history that’s worth a whole lot more than 25 cents. Keep your eyes open, and your coin collection might just include a hidden treasure.
FAQ’s:
1. What causes mint errors like the extra leaf on the Wisconsin quarter?
It likely occurred from accidental or deliberate die alterations, which resulted in extra design elements not meant to be there.
2. How can I tell if my quarter is struck on a foreign planchet?
Check the weight and thickness—it may be lighter or have details from another coin underneath the U.S. design.
3. Is the “spitting horse” error on all 1999-P Delaware quarters?
No, only some coins from the Philadelphia Mint have the die crack that creates the spitting effect.
4. Are state quarters with errors worth more than regular ones?
Yes, state quarters with verified mint errors can be highly valuable to collectors, especially in mint condition.
5. Should I get my error quarter professionally graded?
Absolutely. A coin graded by PCGS or NGC will be authenticated and could sell for a significantly higher price.
