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<p>[QUOTE=&quot;jgenn, post: 5244492, member: 78525&quot;]I should have mentioned that even without a good SG, the coin appears to be &quot;market acceptable&quot; in terms of how these coins are judged to be &quot;authentic&quot; by most buyers and sellers.</p><p><br /></p><p><br /></p><p><br /></p><p>That seems reasonable considering the silver content dropped to 89.6 % in 1785.&nbsp; If you really want to go the extra mile, an XRF reading that shows a small fraction of gold content would be the last measurement to conduct.&nbsp; Silver ore from the mines of Mexico all contain trace amounts of gold and the refining techniques of the time could not remove all of it so any genuine silver coins of colonial Mexico will show some gold content.&nbsp; My understanding is that even handheld XRF devices, sometimes used at jewelry stores or pawn shops, are sensitive enough to detect this small amount of gold.</p><p><br /></p><p>You may ask &quot;why would anyone counterfeit a common silver coin with the proper amount of silver?&quot;&nbsp; The answer is that Chinese silver importers placed such a high premium on &quot;CAROLUS&quot; 8 reales that it was profitable through the beginning of the 20th century.&nbsp; You should read some of swamperbob&#039;s posts and <a href="https://www.amazon.com/Counterfeit-Portrait-Eight-Reales-real-Reales-dp-1500497177/dp/1500497177/ref=mt_other?_encoding=UTF8&amp;me=&amp;qid=" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.amazon.com/Counterfeit-Portrait-Eight-Reales-real-Reales-dp-1500497177/dp/1500497177/ref=mt_other?_encoding=UTF8&amp;me=&amp;qid=" rel="nofollow">his book</a> for more details.&nbsp; Hopefully, he will comment on your post in CCF.[/QUOTE]</p><p><br /></p>

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