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<p>[QUOTE=&quot;physics-fan3.14, post: 3316194, member: 19165&quot;]NGC doesn&#039;t really have a clearly defined and published standard, which is something that I&#039;ve mentioned a few times to them. It&#039;s basically &quot;a few inches&quot; of reflectivity, which means that a reflection is clear and crisp from a few inches away. </p><p><br /></p><p>As for comparing them to proofs.... that&#039;s tricky. The mirrors have a very different character. Proof mirrors will have flowlines, but they don&#039;t have die polish - they are more &quot;glassy&quot;. While the die polish is more subtle on these coins than the San Francisco coins of the 40&#039;s, there is still noticeable die polish. I would say that the obverse of both of these compares to a proof struck from older dies, one that has weaker mirrors. But the &quot;feel&quot; of them is quite different, if that makes any sense.[/QUOTE]</p><p><br /></p>

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