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<p>[QUOTE=&quot;Kentucky, post: 1660474, member: 33176&quot;]I am sure the experts will chime in, but let me beat them to the punch with my limited knowledge.&nbsp; A modern proof usually has a mirror background, older proofs will not necessarily have that.&nbsp; There are &quot;markers&quot; which distinguish proofs, like placement of some of the details in the legends, etc.&nbsp; I don&#039;t know what these are, but I have seen them refered to by some of the more knowledgeable people here.&nbsp; I look forward to their input on an interesting question.[/QUOTE]</p><p><br /></p>

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