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<p>[QUOTE=&quot;kaparthy, post: 25121, member: 57463&quot;]Right on! According to the PCGS Grading Guide, the screw press was developed in the late 15th century by Donato Bramante.&nbsp; Getting the edges machined took longer.&nbsp; The invention of the Castaing device in 1685 was the best of a long line of attempts.&nbsp; A hundred years later, it was employed at the US Mint though even into the early 1800s, half dollars were still struck &quot;open collar.&quot;&nbsp; </p><p><br /></p><p>It might be that we all spend too much time inspecting coins with a magnifier without understanding how they were made.&nbsp; This is perhaps less true of world and ancient collectors.&nbsp; The same might be said of paper money and its aficiandos.</p><p><br /></p><p>I share the same guilt.&nbsp; I had to look up the Castaing machine and I still do not know if this is how DECUS ET TUTAMEN first was inscribed on the edges of British coins or who the monarch was.&nbsp; There is so much to know.[/QUOTE]</p><p><br /></p>

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