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<p>[QUOTE=&quot;calcol, post: 2471661, member: 77639&quot;]I don&#039;t know that PCGS has released much detail about their laser scanning.&nbsp; My guess it that is a type of confocal scanning of obverse and reverse and perhaps the edge as well.&nbsp; I don&#039;t know the resolution they use or whether they use multiple wavelengths.&nbsp; If done with enough resolution, even MS70 coins fresh off the press will produce different images.&nbsp; Changes in surface coloration can be detected, but even with coloration changes, all the nicks, unevenness, striking variation, etc. will make the coin uniquely identifiable.&nbsp; The only thing that can that can defeat it is to put on more dings or wear it down, both of which will lower the grade.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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