Aye I was referring to the trace elements, specifically the precious metals you mentioned. Hehe, once I get everything properly cataloged and in order (I'm still chipping away at it) I'm most certainly taking you up on that offer, as only a handful of the pieces in my collection (such as those I've mentioned above) have been given proper XRF. :-)
Alan Herbert the noted error specialist called these "SEWER COINS" since chemical treatment has caused this incuse effect. Post mint damage - 100% certainty.
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