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<p>[QUOTE=&quot;borgovan, post: 785313, member: 13016&quot;]The PCGS Guide to Grading and Counterfeit Detection has a section on altered coins, which includes a subsection on cleaned coins. There are descriptions of the various types of cleaning, as well as photographic examples.</p><p>&nbsp;</p><p>There is no substitute to having coins in-hand, though. When you&#039;re at a coin show, look for coins that are in ANACS &quot;details&quot; holders that state the coin has been cleaned. Study these, and you will begin to learn. You may also consider asking dealers. Just tell them you want to learn about cleaned coins, and ask if they have any examples. This will work best with a dealer with whom you are already somewhat familiar.[/QUOTE]</p><p><br /></p>

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