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<p>[QUOTE=&quot;Bill in Burl, post: 2968896, member: 23692&quot;]Here is the answer that I gave you on the PCGS forum:</p><p><br /></p><p>With the P mintmark, it is Potasi, Bolivia, but the P could also stand for Peru, since Potasi was part of the viceroyalty of Peru. The assay mark (B) was Juan Ballesteros (1577-1587). All the shield cobs before 1617 are undated. I am not a cob expert, but knew that I had the book &quot;The Practical Book of Cobs, 1990&quot; so I looked at the book. I could be wrong, but that&#039;s what you get having a cob rookie look things up. My expertise is Canadian Vicky Large Cents.</p><p><br /></p><p>The assayer Juan Ballesteros (assay mark &quot;B&quot;) returned to the job and worked on and off from 1591-1615 with other assayers.&nbsp; Your coin is a 1 real and could be from either Felipe II(1556-1598) or Felipe III (1598-1621).&nbsp; Someone else looked it up and found this for you:&nbsp; <a href="https://en.numista.com/catalogue/pieces61946.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.numista.com/catalogue/pieces61946.html" rel="nofollow">https://en.numista.com/catalogue/pieces61946.html</a></p><p>However, the &quot;B&quot; assayer worked mostly earlier than Felipe III.&nbsp; Your coin is too worn on the right side of the Mint/Assay side to see which ruler.&nbsp; Other Potasi coins had the Monarch on that same side.[/QUOTE]</p><p><br /></p>

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