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<p>[QUOTE=&quot;COOPER12, post: 8357669, member: 111228&quot;]A sigma tester only measures the resistivity of a sample and compares it to a programmed &quot;standard&quot;.&nbsp; Basically it&#039;s a go/no go gage.&nbsp; With all of the compositional variability due to remelting old coinage, and minor impurities in the non silver part, etc, I would think that the error bars on pre 1900 vs post 1900 would be too large to provide a meaningful result.&nbsp; No problem with the 90% silver part, but classifying by century? Seems like a huge stretch.&nbsp; Either Sigma Analytics is making some big claims, or someone is misinterpreting the testing capabilities</p><p><br /></p><p>BTW: None of this is germane to the question in the OP.&nbsp; Just trying to understand this particular statement[/QUOTE]</p><p>I am not sure how they can tell but I’ve seen it showing this on a few different results from different people testing different dollars.[ATTACH=full]1483331[/ATTACH][/QUOTE]</p><p><br /></p>

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