Quick summary
- Valuable dates, silver dollars and gold coins are common targets for counterfeiters.
- Weight and diameter checks against official specifications catch many fakes.
- Soft details, odd lettering and seams on the edge are warning signs.
- Under the Hobby Protection Act, replica coins sold in the U.S. must be marked ‘COPY.’
- Buying certified coins, and checking their certification numbers, is the best protection for valuable coins.
Counterfeit coins range from crude castings to high-quality fakes made to fool collectors. You don’t need to be an expert to avoid most of them, but you do need to slow down and check.
What gets faked
- Valuable dates and mint marks, sometimes by altering a common coin.
- Silver dollars, such as Morgan and Peace dollars.
- Gold coins and bullion.
- Famous error coins, like copper 1943 cents.
Simple checks
- Weight: use a digital scale accurate to 0.01 gram and compare with official specifications.
- Size: measure diameter and thickness with calipers.
- Details: look for mushy design details, odd fonts or uneven lettering.
- Edges: look for seams or file marks, a sign of a cast fake, and check that reeding looks even.
- Surfaces: pimples, pits or a greasy look can indicate casting.
Collector’s tip
Compare a coin you’re unsure about with a genuine example of the same type, side by side. Differences in lettering and details often jump out.
Replicas and the “COPY” rule
In the U.S., the Hobby Protection Act requires imitation coins to be marked “COPY.” Replicas without the mark, or with the mark removed, can end up being sold as genuine.
Certified coins
For valuable coins, buy coins certified by a major grading service. Check the certification number on the grader’s website, compare the coin with the online images and examine the holder for signs of tampering. Our guide to coin grading explains how certification works.
Buy from people you can trust
Prices far below market value are a warning sign. Buy from reputable dealers with clear return policies, and avoid sellers who pressure you or won’t answer questions; our guide to buying coins safely covers more.
Collector questions
Does a magnet test prove a coin is genuine?
No. Silver and gold aren’t magnetic, so a magnetic ‘silver’ coin is fake. But many fakes aren’t magnetic either, so passing the test proves little.
Can grading holders be faked?
Yes. Counterfeit holders exist, which is why you should check the certification number on the grading company’s website and compare the photos.
Are replica coins illegal?
Replicas are legal in the U.S. if they’re properly marked ‘COPY’ as required by the Hobby Protection Act. Selling unmarked replicas as genuine is fraud.
What if I bought a fake?
Contact the seller right away and use any return policy or buyer protection. Report fraud to the marketplace and, in the U.S., to the FTC.
Coin values change with demand, condition and metal prices. This guide is general information, not an appraisal or investment advice.
