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<p>[QUOTE=&quot;iPen, post: 2716463, member: 69760&quot;]Both NGC and PCGS grade GSA Morgan dollars with their original GSA slabs. Some of these GSA Morgans are graded as PL or even DMPL. But, how do they control for the reflection of light and the mirroring effect of the plastic slabs? </p><p><br /></p><p>In person, I can see how a strong mirror through any plastic slab or sleeve is obvious, and it&#039;s generally easy to identify modern proofs&#039; mirroring through slabs. But, when the coin is bordering between PL and DMPL, and between &quot;no&quot; mirroring (semi...) and PL, wouldn&#039;t the slab give off added mirroring and give more leeway to the coin&#039;s mirroring properties? Or, do they have a different method to test the mirroring levels of slabbed coins?</p><p><br /></p><p>By the way, if I try and test the reflection of the coin through an original government cellophane package, say on a 1965-1967 SMS set, it&#039;s difficult to tell if the coin itself reflects the text, or the plastics doing most or all of the reflecting.</p><p><br /></p><p>Thanks in advance![/QUOTE]</p><p><br /></p>

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