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<p>[QUOTE=&quot;RomanTheRussian, post: 1729135, member: 7539&quot;]Not going to comment on authenticity, since pillars are not my forte, but I can clarify what &quot;plata agria&quot; is. This term in Spanish numismatics refers to areas of visible planchet stress marks. This can be often seen on weakly struck coins, or coins struck on planchets of uneven thickness. If you can imagine, when silver bars were rolled out to the right thickness, before planchets were punched out of that sheet, the surface of the metal was covered in stress marks from the pressure that metal experienced during this process. These stress marks were eliminated when the coin was struck except in cases I mentioned above. These stress marks are areas of &quot;plata agria&quot;. By the way, I don&#039;t see this occurring on the originally posted coin. </p><p><br /></p><p>Some examples:</p><p><br /></p><p>Look at the area on the obverse near the first two digits of the date:</p><p><br /></p><p><img src="http://www.sixbid.com/images/auction_images/631/641970l.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Here&#039;s another example. Plata agria on the obverse right field:</p><p><br /></p><p><img src="http://media.liveauctiongroup.net/i/9146/10187838_1.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>~Roman.[/QUOTE]</p><p><br /></p>

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