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Do NGC or PCGS ever use XRF machines for coin authentication?
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<p>[QUOTE="calcol, post: 7928311, member: 77639"]It was a pattern in the goloid series. Many patterns were struck in multiple metals with the same dies ... sometimes more than six alloys. Many of the silver and copper alloys can't be distinguished by eye. However, when these patterns were first submitted as raw coins for TPG grading, the grading services took the word of the submitter as to which alloy it was. In many cases, the submitter had it wrong, and the error was carried forward for decades. Many of the pattern alloy designations on slabs today are questionable. Some auction houses, like Heritage, will sometimes note that a pattern that's up for auction is of uncertain metal composition.</p><p><br /></p><p>The whole story of my coin is pretty long and complex. I may write an article on it someday.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 7928311, member: 77639"]It was a pattern in the goloid series. Many patterns were struck in multiple metals with the same dies ... sometimes more than six alloys. Many of the silver and copper alloys can't be distinguished by eye. However, when these patterns were first submitted as raw coins for TPG grading, the grading services took the word of the submitter as to which alloy it was. In many cases, the submitter had it wrong, and the error was carried forward for decades. Many of the pattern alloy designations on slabs today are questionable. Some auction houses, like Heritage, will sometimes note that a pattern that's up for auction is of uncertain metal composition. The whole story of my coin is pretty long and complex. I may write an article on it someday. Cal[/QUOTE]
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Do NGC or PCGS ever use XRF machines for coin authentication?
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