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<p>[QUOTE=&quot;GDJMSP, post: 186524, member: 112&quot;]Fair enough - <i>The Milled Columnarios Of Central And South America</i> by Frank F. Gilboy. Now you&#039;re probably going to tell me that this book only deals with the pillar &amp; wave design, and you are correct. But in this book it also explains how and why the edge design came to be as well as the differences in the edge designs for each mint and date periods and why there were differences in the edge design to begin with. And that is the important part here - the why.</p><p><br /></p><p>You are correct in the method you describe for imparting the edge design, but you are incorrect in assuming that having only one edge overlap, or even no edge overlap, has anything to do with the number of edge dies used. What it has to do with, and the why or the reason there were differences, is the size of the coin or planchet. For if the size varied at all, then the overlap of the edge design or lack thereof would be entirely dependant on what exactly the size was - this was the critical issue.</p><p><br /></p><p>Now, that being said - the edge dies were made by hand just like the obverse &amp; reverse dies. And because they were made by hand there were certain variances - no two dies were exactly alike. And that is why at the different mints and for different date periods there were differences. Even with the pillar &amp; wave series, some of the mints were able to achieve only 1 edge overlap and sometimes no overlap at all. This of course was determined by what the exact size of the coin and the exact size of the dies. The size of coin that worked best to produce seamless edges was 39.2 to 39.8 millimeters. This allowed the edge design to be imparted almost perfectly - seamlessly.</p><p><br /></p><p>Anyway, by 1770 - 1771 almost all of the mints, with the exception of Lima, had managed to consistently produce planchets of the correct size. And when the portrait series began in 1772 this level of quality continued for the most part. There were exceptions of course where the planchet size varied slightly and when it did the overlap of the edge design also varied.</p><p><br /></p><p>So, just like with the pillar &amp; wave series the edge design of the protrait series also vaired. Sometimes there were two overlaps, sometimes one and sometimes there was no overlap to be found at all. It was inevitable due to slight variations in planchet size as well the edge dies themselves.[/QUOTE]</p><p><br /></p>

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