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<p>[QUOTE=&quot;Ed Snible, post: 7425822, member: 82322&quot;]Yes, I meant to say &quot;top 20% (80% percentile)&quot; but I screwed it up.</p><p><br /></p><p>The NGC Ancients literature says that the x/5 numbers represent percentiles.&nbsp; However, it isn&#039;t true.&nbsp; For example less than 1% of the coins graded are 1/5.&nbsp; That might make sense for common coins (few submit dog coins) but for great rarities we expect nearly 20% of the coins being 1/5.&nbsp; Barry Murphy gave a better answer for what the x/5 numbers mean in</p><p><a href="https://www.cointalk.com/threads/quiz-how-much-this-surface-would-score-in-ngc-scale.339959/page-2#post-3565478" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/quiz-how-much-this-surface-would-score-in-ngc-scale.339959/page-2#post-3565478">https://www.cointalk.com/threads/quiz-how-much-this-surface-would-score-in-ngc-scale.339959/page-2#post-3565478</a></p><p><br /></p><p>I did a blog post five years ago some of you might find interesting</p><p><a href="https://digitalhn.blogspot.com/2015/10/grading-parthian-coins.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://digitalhn.blogspot.com/2015/10/grading-parthian-coins.html" rel="nofollow">https://digitalhn.blogspot.com/2015/10/grading-parthian-coins.html</a></p><p><br /></p><p>I searched for a particular Parthian coin, the one cataloged as &quot;Sellwood 33&quot;, and made a chart just showing the high point on this coin, the cheek strap, along with the grade the dealer gave it.&nbsp; I encourage everyone interested in grading to repeat the exercise for a coin type you know.&nbsp; How do different dealers and services grade the same exact type?[/QUOTE]</p><p><br /></p>

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