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<p>[QUOTE=&quot;Colonialjohn, post: 3023475, member: 57741&quot;]Interesting with these pieces using die rotation as an anti-counterfeiting method. Jack Young you could also use XRF. Possibly. These early 1793 Cents probably have high sulfur and chlorides and a specific set of XRF impurities as compared to modern copper. XRF assay just being ANOTHER tool to use and of course not a sole source to accept or kill a piece as a modern forgery. You could use SEM micrographs but the numismatic world is not there yet ... not for another 50 years.</p><p><br /></p><p>John Lorenzo[/QUOTE]</p><p><br /></p>

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