Modern Mules: The Rarest Error Coins

By Bullion Shark LLC ……

When it comes to error coins, a mule is simply a coin that was struck from a die pair that was not intended to go together, and that can be the obverse die, the reverse die, or even the collar die. The two types of mules are those that pair the obverse of one coin with the reverse of another coin of the same series, and those that pair the obverse of one coin with the reverse of a different type of coin. All mules are extremely rare, often even unique, but in general, they are the rarest type of error coin that exists. And mules of different coins are the rarest of the rare.

The denomination of a mule is determined by the planchet used for that coin. And of those mules that exist, most were created from coins whose planchets happen to be very close in size to each other, such as the Lincoln cent and the Roosevelt dime, or the Washington quarter and $1 coins like the Presidential and Sacagawea/Native American golden dollars.

2000-P Sacagawea Dollar Muled with Statehood Quarter

Moreover, mules of modern circulating coins are so rare that they did not even exist, or at least had not been discovered, until the year 2000.

In May of that year, collector Frank Wallis of Arkansas made numismatic history with the first discovery of a 2000-P Sacagawea dollar in a roll of those coins that was paired with the obverse of a Statehood quarter with the reverse being the flying eagle design of the Sacagawea coins.

Today there are 19 confirmed examples of this amazing mule error coin that is known as the king of U.S. Mint errors and was ranked the #1 U.S. error coin of all time in the popular book 100 Greatest U.S. Error Coins.

Since then, we have learned that this error was struck from three different die pairs that are discernable based on some die cracks or die gouges on those coins. The United States Mint confirmed the coin’s existence the following month and has also indicated more recently that as many as 350,000 of these mules were produced on three adjoining coin presses, which is why there are three die pairs.

The coins were also all produced at the Philadelphia Mint, which is where subsequent examples were discovered, and their delivery was traced to a particular armored carrier company in the same city. Most examples were destroyed apart from the 19 examples discovered to date, of which six have been graded by PCGS and 11 by NGC. There could be others in theory, but it seems likely they would have been found by now unless they are sitting in sealed rolls or bags.

The second example of this coin discovered was actually the first one sold, which happened on eBay on July 7, 2000, for $41,395 USD. This was a time when eBay was still establishing itself as a platform for buying and selling coins. The sale of this coin received so much attention that it is believed to have played a key role in cementing eBay’s role in this area.

The first time one of these celebrated errors was sold at auction was an MS66 PCGS coin from die pair #1 that sold in August 2000 for $29,200. That example, which was the discovery coin, was sold again in 2001 for $67,000.

After that, sales of the other examples continued to trend higher, reaching as much as $192,000 in a March 2018 sale for an MS67 NGC from die pair #1.

Currently, PCGS values the coin at $200,000 at the top grade of MS67, and NGC values examples at the same grade at $235,000.

Other Modern Mules

On January 14, 2021, NGC certified the first discovery of a mule that combines the obverse of a Sacagawea dollar with the reverse of a $1 Presidential coin struck in 2000 at the Denver Mint that received a grade of AU58. Both types of golden dollars were being produced at Denver that year, and the mule was discovered in a mixed bag of dollar coins obtained from a bank in 2019.

The day after NGC made this announcement, the U.S. Mint said that it had been aware of the coin since 2014, and they had implemented multiple new controls and mistake-proofing procedures to prevent a similar item from being made in the future. They did not disclose how it was made, however, nor how many they believed had been produced, nor what controls and procedures they had put in place. It is also not known if the obverse had been intended to be paired with the normal reverse of the Sacagawea dollar, or if the reverse had been meant for one of the Presidential dollars that were being made that year.

When the latter coins were first made, hundreds of thousands of errors were made that involved the edge of the coins, where the date, mint marks, and, for a time, the motto “In God We Trust” appeared. The Mint would later change its coinage presses so that the coins would have their correct edge inscriptions imparted during the production process instead of being done afterward in a separate location.

Another recent mule discovery paired a 2001-D Lincoln cent obverse with the reverse of a Roosevelt dime. That specimen, which graded MS65 Red PCGS and is the second known example of this particular mule, sold on February 22, 2022, for $78.000.

If you think you have discovered a mule, it is important to have it evaluated by at least a knowledgeable dealer and then by either PCGS or NGC since there have been cases of counterfeit mules, which are typically created by cutting two coins in half or grinding them down and then gluing the two sides together.


  1. Hi my name is Tanya and I do have a 1 dollar gold sagawa coin how can I tell if it is the one that they are looking for

    • Tanya, please scroll near the top of this article and look for the two images of the gold quarter. On the left is George Washington and on the right is the back of a Sacajawea quarter. Is that what the back of your coin looks like? If it is, then it is not rare or valuable.

    • Also remember that these coins aren’t really gold. They’re made of copper and manganese brass – no precious metal.

    • The sculptor’s name is actually St. Gaudens, but his designs weren’t used on American Silver Eagle coins. The Walking Liberty obverse is a rendering of A. A. Weinman’s design used on 1916-47 half dollars. A quick search will show the two different designs used for the reverse side, neither of which is by either sculptor.

      Without images it’s very tough to guess what you might have. It could be a fantasy piece struck in base metal or actual silver, or it could be two different coins that were cut and re-joined, much like magician’s coins.

  2. I have a 1960 Nickle with a bar over the zero have not seen any others like this as years ago I would see of this was common?

    • A quick online search for “1960 nickel* bar over 0” will show this was a fairly common error. It’s thought to have been caused by small die breaks near the edge.

      Barring affected both digits and letters on nickels minted at that time. There’s even a specimen with bars over the E, R, T, 6, and 0. I’d post photos but I don’t think it will work on this site.

      (*) rather than “nickle” :)

  3. Hi my name is Charles I have a Lincoln penny on One reverse and I have a wheat penny on the other side don’t know the date because it’s two reverses looks really authentic can’t find it anywhere can you tell me something about this coin

    • It’s most likely you have what’s called a “magician’s coin” which, as is explained in the article, “[is] typically created by cutting two coins in half or grinding them down and then gluing the two sides together.”

      Modern magician’s coins sell for a few dollars in novelty shops. A lot of them are made with automated equipment that cuts the original coins very precisely, which can make it difficult to see any obvious seams or joining. You can always take it to a dealer for evaluation but be prepared for a “nope” answer.

  4. I have a 1972 no mint penny that has markings of another penny over it like it has some of the lettering on the rim and it has the back stamped on the front some and it’s just got many errors is it worth any money??

  5. I have a 1977 penny but it’s not a copper/brass color….it is a silver or aluminum color….so strange. Is it a real penny?

    • It’s unlikely to be an error coin, but a first-order test would be to weigh it. Normal bronze cents from 1977 would weigh 3.11 gm. If your cent’s weight is significantly different from that it might be an off-metal error but you’d need to have it inspected by a professional. If it weighs around 3.11 gm it was probably plated or otherwise altered after leaving the mint. In school chemistry classes we used to play games with plating coins, especially cents because of their (then) high copper content.

  6. I received an uncirculated mint set several years ago as part of my subscription. Upon inspection, I found the cent was missing from the Philadelphia set. There was no evidence of opening or tampering, but that is the way it was packed by the mint.
    Is there any value to this type of mint error?

  7. I have a 1965 quarter it’s flat on both sides it looks like the ends were flipped over and it was smashed into the quarter. It has a copper center near close to the edge but on both sides of the coin it has a gold color it’s not like a rainbow type of color it’s actually gold it looks like gold on both sides pretty solid have any ideas about that thanks

  8. I have two gold quarters. I’ve had them approximately 11 years. The one quarter was made in 2007 and is the Montana emblem on the back. The other was made in 2001 and the back is the Rhode island emblem. Can you tell me if I have something important?

  9. I also have a silver two headed quarter. On one side the date is 1988. The other side is dated 1989. Do I have something?


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