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<p>[QUOTE=&quot;JCro57, post: 7475245, member: 92083&quot;]It is useful to know how certain forms of damage occur. Acid, buffing/whizzing, heat/torching, grinders, plating, strikes with fake dies, vise jobs, etc.</p><p><br /></p><p>Studying these makes it easier to identify why a psossible error is not an error.</p><p><br /></p><p>However, one does not need to prove exactly how damage occurred. What matters is that one can prove why it is a genuine error, and for that you need to have a good understanding of the minting process both how they&#039;re made now and how they used to be depending on the year the coin was made[/QUOTE]</p><p><br /></p>

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