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<p>[QUOTE=&quot;messydesk, post: 7598805, member: 1765&quot;]Grading is a continuum only in 4 dimensions -- strike, luster, surface preservation, and eye appeal.&nbsp; Surface preservation is additionally problematic because degree of contact marks and degree of wear are arguably continua of their own, with both coming into play in the AU range.&nbsp; The problem comes when we try to project this 4-dimensional grade into a single number to be used as a proxy for value.[/QUOTE]</p><p><br /></p>

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