Common Fakes & Counterfeits
Screening tips by category, each tied to two or more independent sources, so you know what to watch for before you bid.
General tips, not authentication. This is an estimate, not an appraisal. When in doubt, use a professional authentication service.
Coins
Key dates attract the most fakes and altered coins. Know where to look before you bid.
Open guide →Bullion
Simple at-home checks catch some fakes but not all of them. Know their limits.
Open guide →Jewelry and gold
Stamps tell you a lot, but they can mislead. Learn what each mark does and doesn't promise.
Open guide →Sports cards
Slabs, certificates and autographs can all be faked. Match everything, not just one detail.
Open guide →Watches
Luxury watches are among the most copied items. Check several details, never just one.
Open guide →Collectibles and antiques
Reproductions copy the look, not the quality. Here's what gives them away.
Open guide →Stamps
Altered stamps are made to look better than they are. Check the back and the edges.
Open guide →These guides are general screening tips, not authentication or appraisals. Sources are independent sites we don't control and aren't affiliated with. Sources checked Nov 2, 2026.
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