Coin Error Guides
Expert guides to identifying valuable minting errors. Learn what to look for, how to check, and what your coins could be worth.
Scan Your Coin Now1979 Susan B. Anthony Dollar Errors
The 1979 Susan B. Anthony dollar was the first small-size dollar coin minted by the United States. Due to production iss...
Half DollarsKennedy Half Dollar Errors
Kennedy half dollars have been minted since 1964 and are one of the most collected US coin series. Numerous minting erro...
Half Dollars1964 Kennedy Half Dollar Errors
The 1964 Kennedy half dollar is the only year struck in 90% silver, making it both a bullion coin and a collector favori...
Half Dollars1974 Kennedy Half Dollar Errors
The 1974 Kennedy half dollar is known for a significant doubled die reverse variety that is one of the strongest doubled...
Half Dollars1976 Bicentennial Kennedy Half Dollar Errors
The 1976 Bicentennial Kennedy half dollar features a special reverse design with Independence Hall. The dual-dated 1776-...
PenniesWheat Penny Errors
Wheat pennies (Lincoln wheat cents) were minted from 1909 to 1958 and are among the most popular US coins to search for ...
PenniesLincoln Memorial Penny Errors
Lincoln Memorial pennies were minted from 1959 to 2008 and are still commonly found in circulation. Many error varieties...
QuartersBicentennial Quarter Errors (1976)
The 1976 Bicentennial quarter features the colonial drummer design on the reverse and the dual date 1776-1976. Billions ...
QuartersState Quarter Errors
The 50 State Quarters program (1999-2008) produced billions of coins across 50 unique designs. The massive production vo...
NickelsJefferson Nickel Errors
Jefferson nickels have been minted since 1938 and contain several key error varieties. The 1939-1964 era is particularly...
DimesRoosevelt Dime Errors
Roosevelt dimes have been struck since 1946. Silver versions (1946-1964) and clad versions (1965-present) both contain n...
Error Type GuidesDoubled Die Coin Errors
A doubled die is one of the most sought-after coin errors. It occurs during the die-making process when the hub impresse...
Error Type GuidesOff-Center Strike Coin Errors
An off-center strike occurs when the coin blank (planchet) is not properly seated in the collar before the dies come tog...
Error Type GuidesDie Crack and Cud Coin Errors
Die cracks and cuds are among the most common mint errors. They occur when a coin die develops cracks from stress and fa...
Error Type GuidesClipped Planchet Coin Errors
A clipped planchet error occurs when the coin blank (planchet) is not properly cut from the metal strip, resulting in a ...
Pennies1955 Doubled Die Penny Errors
The 1955 doubled die Lincoln cent is the most famous error coin in American numismatics. The dramatic doubling on the ob...
PenniesClose AM and Wide AM Lincoln Penny Varieties
The Close AM and Wide AM varieties are among the most exciting modern Lincoln cent finds. The spacing between the A and ...
DollarsMorgan Silver Dollar Errors
Morgan silver dollars (1878-1921) are among the most collected US coins. Their large size and high relief make errors ea...
DollarsSacagawea Dollar Errors
Sacagawea dollars (2000-present) launched with massive production and several notable errors. The most famous is the 200...
NickelsBuffalo Nickel Errors
Buffalo nickels (1913-1938) are beloved for their iconic American design. The high-relief design led to rapid die wear, ...
DimesMercury Dime Errors
Mercury dimes (1916-1945) are among the most beautiful US coin designs. Several key dates and error varieties make them ...
Half DollarsWalking Liberty Half Dollar Errors
Walking Liberty half dollars (1916-1947) are considered one of the most beautiful US coin designs. The high relief and c...
DollarsEisenhower Dollar Errors
Eisenhower dollars (1971-1978) are the last large-size dollar coins. Both clad and 40% silver versions exist, and severa...
QuartersStanding Liberty Quarter Errors
Standing Liberty quarters (1916-1930) are one of the most beautiful US coin designs but also one of the most wear-prone....
DollarsPeace Dollar Errors
Peace dollars (1921-1935) feature a stunning Art Deco design. While fewer varieties exist compared to Morgan dollars, se...
PenniesIndian Head Penny Errors
Indian Head pennies (1859-1909) are among the oldest commonly collected US coins. Despite their age, many error varietie...
Nickels2005 Westward Journey Buffalo Nickel Errors
The 2005 Westward Journey series reused the buffalo design for one year. Due to high demand and production volume, sever...
Error Type GuidesBroadstrike Coin Errors
A broadstrike occurs when a coin is struck without the retaining collar that normally holds the coin blank in place and ...
Error Type GuidesWrong Planchet Coin Errors
A wrong planchet error occurs when a coin is struck on a blank intended for a different denomination or even a foreign c...
Error Type GuidesDie Clash Coin Errors
A die clash occurs when the obverse and reverse dies strike each other without a planchet between them. This transfers f...
Error Type GuidesStruck Through Coin Errors
A struck-through error occurs when foreign material gets caught between the die and the planchet during striking. The re...
Pennies1972 Doubled Die Penny Errors
The 1972 doubled die penny is one of the most popular and widely collected Lincoln cent errors. Strong doubling is visib...
Pennies1969-S Doubled Die Penny Errors
The 1969-S doubled die penny is one of the rarest and most valuable Lincoln cent errors, with specimens selling for $25,...
Pennies2009 Lincoln Bicentennial Penny Errors
The 2009 Lincoln Bicentennial pennies feature four unique reverse designs celebrating Abraham Lincoln's 200th birthday: ...
Nickels1942-1945 War Nickel Errors
War nickels (1942-1945) were struck in a special alloy of 56% copper, 35% silver, and 9% manganese to conserve nickel fo...
Nickels2004-2005 Westward Journey Nickel Errors
The Westward Journey nickel series (2004-2005) featured four special designs commemorating the Lewis and Clark expeditio...
Dimes1996-W Roosevelt Dime Errors
The 1996-W Roosevelt dime is the only US dime ever struck at the West Point Mint for circulation-type coinage. Approxima...
Dimes1982 No P Roosevelt Dime Errors
The 1982 No P Roosevelt dime is one of the most famous mint mark errors in US coinage history. When the Philadelphia Min...
Quarters2000 Sacagawea Dollar / Quarter Mule Errors
The 2000 Sacagawea dollar / Washington quarter mule is one of the rarest and most valuable modern US coin errors. These ...
QuartersWashington Quarter Errors (Pre-1965 Silver)
Silver Washington quarters (1932-1964) are among the most widely collected US coins. Struck in 90% silver, these quarter...
Quarters2019-W Quarter Errors
The 2019-W quarters mark the first time the West Point Mint struck quarters intended for general circulation. Approximat...
Half DollarsFranklin Half Dollar Errors
Franklin half dollars were minted from 1948 to 1963 and are struck in 90% silver. Designed by John R. Sinnock, these coi...
Dollars2000 Sacagawea Dollar Cheerios & Errors
The 2000 Sacagawea dollar launched with a massive promotion where 5,500 specially marked Sacagawea dollars were inserted...
DollarsPresidential Dollar Errors
The Presidential dollar series (2007-2016) features 39 different presidents and is notorious for its wide range of minti...
Dollars1921 Morgan Dollar Errors
The 1921 Morgan dollar is the last year of this iconic series and was struck in enormous quantities at Philadelphia, Den...
Error Type GuidesLamination Errors Guide
Lamination errors occur when impurities, gas pockets, or improperly mixed alloys in the planchet cause layers of metal t...
Error Type GuidesRepunched Mint Mark (RPM) Guide
Repunched mint marks (RPMs) occur when the mint mark was manually punched into the working die more than once, resulting...
Error Type GuidesMule Coin Errors Guide
A mule error occurs when a coin is struck using two dies that were never intended to be paired together. This can involv...
Error Type GuidesDouble Struck Coin Errors Guide
Double struck errors occur when a coin receives two or more impressions from the dies, typically because the coin failed...
Error Type GuidesMost Valuable Error Coins
Error coins are among the most valuable collectibles in numismatics. Manufacturing mistakes at the US Mint can turn ordi...
Dollars1979 Dollar Coin Errors
The 1979 Susan B. Anthony dollar was the first small-size dollar coin in US history, and its debut year was plagued with...
Dollars1921 Silver Dollar Errors
The year 1921 is unique in U.S. coin history because it is the only year that both Morgan and Peace silver dollars were ...
Dollars1921 Peace Dollar Errors
The 1921 Peace dollar is a one-year-only high-relief design and one of the most coveted silver dollars in U.S. numismati...
Pennies1982 Penny Errors
1982 is the most complex year in modern Lincoln cent history. The U.S. Mint transitioned from 95% copper to copper-plate...
Pennies1999 Penny Errors
The 1999 Lincoln cent is famous for the rare Wide AM reverse variety, where the letters A and M in AMERICA are spaced ap...
Pennies1943 Steel Penny Errors
In 1943, the U.S. Mint switched from copper to zinc-coated steel for the Lincoln cent to conserve copper for World War I...
Pennies1972 Lincoln Penny Errors
The 1972 Lincoln cent is famous for one of the most dramatic and valuable doubled die obverse varieties in modern U.S. c...