Quick summary
- Errors are one-off production mistakes; varieties come from a die and appear on many coins.
- Common errors include off-center strikes, clipped planchets and die cracks.
- Doubled die coins show true doubling of the design; ‘machine doubling’ is common and adds little value.
- Damage after a coin leaves the Mint is not an error and doesn’t add value.
- Valuable errors should be authenticated by a professional grading service.
Modern minting is highly automated, but mistakes still happen. Error coins have their own dedicated collectors, and learning the basics helps you recognize genuine finds.
Errors versus varieties
- Errors are individual mistakes made while a coin was struck, such as a coin struck off-center.
- Varieties come from a die that differs from normal, so the same feature appears on every coin struck with that die.
Common types of errors
- Off-center strikes: part of the design is missing because the blank wasn’t centered.
- Clipped planchets: a curved or straight piece is missing from the edge of the blank.
- Die cracks and cuds: raised lines or blobs caused by cracks or breaks in the die.
- Double strikes: the coin was struck twice, often off-center the second time.
- Wrong planchet: a coin struck on a blank meant for another denomination or metal.
Doubled dies
On a doubled die, the die itself was made with doubled design elements, so letters and numbers appear clearly doubled. The 1955 doubled die obverse Lincoln cent is one of the most famous U.S. examples. The 2004 Wisconsin quarter “extra leaf” varieties are a more recent favorite.
Be careful
Be skeptical of dramatic “errors” for sale online. Coins can be altered or damaged to look like errors, and valuable errors are often faked.
Damage is not an error
Coins can be bent, scratched, plated or altered after they leave the Mint. This post-mint damage doesn’t add value. Signs include marks that cut into the design, or metal pushed up around a mark.
Next steps
If you think you’ve found something special, compare it with reliable references and photos, ask an experienced collector, and consider professional authentication for potentially valuable coins. Our guides to coin grading and spotting counterfeit coins explain more.
Collector questions
Is my 1943 penny valuable?
Most 1943 cents are made of zinc-coated steel and are common. A small number were struck in copper by mistake and are extremely rare, so copper 1943 cents are often faked.
Why does my coin look doubled?
It could be a doubled die, machine doubling or damage. True doubled dies show separated, rounded doubling of design elements; flat, shelf-like doubling is usually machine doubling.
Can an error coin be found in change?
Yes, minor errors and some varieties do turn up. Dramatic errors are rarer, as most are caught at the Mint.
Where can I learn more about varieties?
Specialist references and collector clubs focused on errors and varieties are excellent resources.
Coin values change with demand, condition and metal prices. This guide is general information, not an appraisal or investment advice.
