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<p>[QUOTE=&quot;Oldhoopster, post: 2871258, member: 84179&quot;]I find it interesting that you appear to an experienced collector based on your comments regarding submissions to TPGs, but you missed the obvious foreign substance on the quarter surface. The biggest giveaway are the circular features, which were caused by bubbles in the glue/residue.&nbsp; A simple acetone dip should tell you if it’s glue.&nbsp; Based on the detail on the coin, I can’t think of another part of the minting process that could result in that type of defect. A shattered die wouldn’t look like this, and the pressure from the strike would have “smoothed out” the high points from a defective planchet (they could still be visible, but not at the relief in your pic). </p><p><br /></p><p>From your pics of the 1990-D, it still looks like there is plating and the color may be due to environmental damage, but sometimes pics can be deceiving.&nbsp; The reverse shows a lot of copper color, but once again, not sure of the pics.&nbsp; The production process plates zinc planchets after they are punched from a strip.&nbsp; The planchets are then immersed in a plating solution, so I don’t see how it’s possible to have one side plated and the other side unplated (look at the link Rick posted).&nbsp; Another thing that immediately stood out is what appears to be long plating blisters under TRUST (and possibly behind Lincoln’s head).&nbsp; Did the dealer suggest doing a quick XRF scan?&nbsp; Many dealers, jewelers and bullion buyers have these units.&nbsp; A short test would easily show if the surface was copper or zinc.&nbsp; FWIW, I don’t think the plating was acid stripped (but am not positive and open to other interpretations)</p><p><br /></p><p>A knowledgeable numismatist should have suggested the acetone bath and XRF test before sending the coins to NGC.&nbsp; In my opinion, your dealer is not a numismatist, but simple coin sellers, and their lack of knowledge just cost you some money.&nbsp; As others have said, I think you should find another dealer who knows more about coins.</p><p><br /></p><p>Finally, I am basing my comments on your pics and not coins in hand.&nbsp; If these do come back as authentic mint errors, please share the results and feel free to shoot an “I told you so” my way.[/QUOTE]</p><p><br /></p>

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