Free Error Coin Identifier
Identify mint errors — doubled dies, off-centre strikes, missing clad layers, die caps, brockages, and more. Powered by AI — completely free, no sign-up required.
About This Tool
Error coins are among the most fascinating and valuable in numismatics. They occur when something goes wrong during the minting process — a die is used twice at a slightly different angle, a planchet is not properly aligned, the clad layer separates, or a coin is struck by a cap die. Our Error Coin Identifier is trained on all major error types and can identify doubled dies (including the famous 1955 DDO Lincoln cent), off-centre strikes, broadstrikes, die caps, brockages, wrong planchet errors, and missing clad layers.
📸 Tips for Best Results
- ✓Doubled die errors show doubling in the design and lettering — photograph close-up to show this clearly
- ✓Off-centre strikes: measure and note the percentage off-centre
- ✓Missing clad layer errors: the inner copper core will be exposed on one or both sides
- ✓Machine doubling (worthless) looks similar to doubled die (valuable) — the AI will distinguish between them
- ✓Photograph any unusual characteristics at extreme close range with good lighting
🏛️ Fascinating Facts
- •The 1955 Doubled Die Obverse Lincoln cent is one of the most famous US error coins — the doubling is visible to the naked eye
- •Wrong planchet errors — coins struck on planchets intended for another denomination — are among the most valuable errors
- •The US Mint recalls and destroys imperfect coins, but some escape into circulation
- •The 1969-S Doubled Die Lincoln cent is so rare that only around 40 examples are known to exist
- •A 1999 Wide AM Lincoln cent — a die variety, not technically an error — is worth over $1,000 in uncirculated condition
Upload Photo
Photograph both sides of the coin on a dark background
AI Analyses
Our AI examines design, lettering, size, and metal
Full Details
Country, year, denomination, mint mark, and estimated value
Frequently Asked Questions
How do I know if my coin is a genuine error or just damage?
Post-mint damage (scratches, dents, environmental damage) is very different from mint errors. Genuine errors occur during the striking process and have consistent characteristics. The AI is trained to distinguish between them.
Are error coins legal to own?
Yes — error coins that enter circulation are legal to own and sell. The US Mint does not pursue the recall of error coins that have entered the public domain.
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