Many of us have encountered members of the 50 State Quarters Program. The distinctive 25-cent pieces, released between 1999 and 2008, pay tribute to the 50 states that make up the United States of America.

The aim of the program was to inspire a new generation of coin collectors. It was relatively easy and inexpensive to achieve a complete set of them, and the US Mint wanted as many people as possible to have that opportunity.

So, during the decade of production, the mint issued roughly 35 billion new coins in the series. However, with so many coins emerging from the presses, mint errors were inevitable.

In some cases, those error coins have become collectors’ items. So, let’s discuss some of the more prevalent known errors on the quarters of the 50 State Quarters Program. Some of them can draw premiums well beyond those of their “regular” counterparts.

What Is a Mint Error?

Mint errors are flaws or variations that a coin incurs during the production process. So, in other words, error coins from the 50 State Quarters Program are the result of deviations on the part of the United States Mint.

Mint errors are not flaws in coins due to circulation. Scuffs, damage, stains, or other disfigurements of coins that happen once they are released into the public are not what we’re describing. So, if you have a coin that looks cruddy or busted, it is likely worth no more than the face value.

If it helps, think of mint errors as institutional errors, where the coin(s) never had a chance to be a correct specimen at any point in their service period. Mint errors are typically unintentional flaws that occur during the minting process, often due to mechanical issues, die wear, or mistakes during setup and production.

Mint errors vary tremendously, but they typically fall into one of three categories.

Die Errors

The first type of mint error is a die error. These kinds of flaws occur when the dies – the metal pieces that bear the coins’ design and make the impression in the blank planchet.

Over time, dies break down due to the intense pressures necessary to create precise coinage. When they do, distinctive errors occur, such as the following:

Doubled dies – Doubled die errors occur during the die creation process when the hub impresses the design into the die more than once at slightly different angles. The result is a doubling of certain elements on the coin.

Die defects – Wherever there are cracks or chips in the die, the surface of the coin cannot be pressed down properly. The result is a coin with raised ridges or blobs that look distinctly out of place.

Strike Errors

The second type of error that may occur is a strike error. In this case, there’s no issue with the die, but the press itself is misaligned.

The result is a coin where the design elements are out of place. Strike errors are easier to spot, especially when they are particularly egregious. Here are some of the more common examples of these errors:

Off-center strikes – Off-center strikes are self-explanatory. When the die is misaligned, it does not strike the planchet squarely, resulting in a coin that just looks off.

Broadstrikes – During striking, the planchet is surrounded by a steel ring called the collar. If the collar fails to engage properly, the coin spreads outward and becomes larger than normal.

Strikethroughs: Minting press areas must be kept extremely clean. Any debris in the area can cause a strikethrough error. If metal shavings, grease, or other material come between the planchet and the die, their shapes can be imprinted on the coin’s surface.

Planchet Errors

The third common type of coin error is a planchet error. In this case, the die and the strike are fine, but there’s a problem with the blank metal discs being sent through the machines.

So, even though the production process was flawless, it was an error from the start. Here are the most common examples of these errors:

Clipped planchets – Planchets begin their lives as sheets of metal. To prepare them for minting, they must pass through a blanking machine, which cuts them to the appropriate shape and size. If any errors occur during this process, the result can be a misshapen planchet that is missing parts or is rough in certain areas.

Wrong planchet strikes – In this case, a blank intended for another denomination or coin type is accidentally fed into the press. This type of error is especially apt to happen when the composition of a coin changes. A wrong planchet strike is why one of the most valuable coins in the world is a 1943 penny, struck on bronze instead of steel.

As we mentioned above, an unusual-looking coin is not more valuable by default. However, if a coin looks different – especially on a structural level – it’s probably worth getting checked out by a professional.

Most Famous State Quarter Errors

Now that we’ve established the most common types of errors, let’s talk about the best-known state quarter errors. In these cases, the coins are known to exist with their specified errors and can be worth a premium over their face values to certain collectors.

2004 Wisconsin “Extra Leaf” Quarter

In 2004, the US Mint paid tribute to the State of Wisconsin with its release. The reverse of the coin featured several images reflecting the state’s various products, including a large ear of corn.

For some reason, however, some of the Wisconsin quarters produced by the Denver Mint featured an additional leaf on the ear of corn. This error is quite noticeable, as it stands out from the rest of the image.

Somewhat incredibly, there are two varieties of this error. They are known simply as the Extra Leaf High and Extra Leaf Low. As you may imagine, the extra leaf is higher and nearer the leaves on the corn on the High, while the extra leaf is lower and nearer the edge of the coin on the Low.

The presence of this error will be worth more, but there will be more for Extra Leaf quarters that are in pristine condition.

1999 Delaware “Spitting Horse” Quarter

Horses can show their displeasure in a variety of ways. They may flare their nostrils, flatten their ears, or swish their tails angrily.

Spitting, however, is more the behavior of an angry llama. So, it came as a surprise to collectors when some versions of Delaware’s state quarter featured Caesar Rodney’s horse “spitting.”

Caesar Rodney was an American Founding Father from Delaware who famously rode 70 miles on horseback during a storm to break a tie in the vote for independence. Thanks to a die crack at the Philadelphia Mint, some of these quarters had a line extending from the horse’s mouth – which made it look like the horse was spitting.

This error is popular among coin collectors. It’s a genuine error, but it’s also quite the novelty because, well, it’s funny.

2005 Kansas “In God We Rust” Quarter

The phrase “In God We Trust” has appeared on American currency since 1864. It became the national motto in 1956. So, it’s a pretty important phrase to get right during the minting process.

Unfortunately, the 2005 release of the Kansas quarter fell notably short in some cases. On one of the dies, the first T in “trust” got mistakenly filled in by some grease.

The result was a somewhat-humorous statement that in God, Kansans rust. Obviously, these error coins are known for their prominent phrase, “In God We Rust,” and are popular among collectors seeking premiums and a bit of levity in their collections.

2005 Minnesota Doubled Die Quarter

2005 proved to be a rough year for the US Mint. The same year that produced “In God We Rust” for the Kansas quarter also produced an error on some of the Minnesota quarters.

In this case, what appears to be an “extra” tree is stamped into the background of the coin’s reverse. The error typically appears as the “fourth” tree from the left – in the gap between the two groups of trees in the design.

Several varieties of this coin exist, and both the Philadelphia and Denver Mints produced their own versions of this error coin. In many cases, the appearance of the extra tree results from die doubling or die deterioration during production. In general, the stronger the error, the more prominent the tree appears, the more valuable the coin tends to be.

How to Identify a State Quarter Error

If you believe you have a state quarter error, or, for that matter, just want to check yours out, there are a few steps you need to take. Ultimately, you’ll need a professional to confirm your findings either way, but it’s not a bad idea to look beforehand. Here’s what to do:

Lay the coin(s) out on a light-colored towel so that they are easy to see in detail.

Get a light source as directly onto the coins as possible. Direct light often reveals many of the finer elements of the coin(s)’ surfaces.

Use magnification of some kind to examine the coin(s). Many errors are not easy to see with the naked eye. If you want to get fancy, you can purchase a coin or jewelry loupe, which fits over your eye and lets you take a closer look hands-free.

Look for anything that looks out of place on the coin surfaces. Be sure to check both the design features and the lettering on the coin.

Use the internet to check your findings and, ideally, compare your coins against the pictured examples there.

Once again, the types of errors that are worth additional money are the ones that occurred at the mint, not after they’ve circulated. So, an old and worn-out coin is not necessarily valuable. It may have simply been through some trauma.

Conclusion

The 50 State Quarters Program is one of the most notable coin series of the 21st century. The series appealed to American coin collectors not only because of their allegiance to their own states, but also because they could collect entire sets relatively easily and inexpensively.

Part of this ease stems from the sheer volume of coins the US Mint released to support the program. Nearly 35 billion quarters have been hit in circulation from this series.

Most of them are worth exactly their face values – even today. However, if you happen to see design elements out of place, you may have a quarter worth preserving on your hands. A coin with a mint error can often be worth more than its normal counterpart, particularly if the error is dramatic or well-known among collectors – even if it’s a humble 25-cent piece.