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2017 Philadelphia Minted Lincoln Shield Cent Struck On Bronze Planchet

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Pillar of the Community
Brandmeister's Avatar
United States
6952 Posts
 Posted 02/04/2026  4:18 pm  Show Profile   Check Brandmeister's eBay Listings Bookmark this reply Add Brandmeister to your friends list Get a Link to this Reply

Quote:
What beam strength XRF does PCGS use?

I doubt that makes much difference. You can blast more X-rays at a surface, effectively increasing amplitude, but you would need higher energy (meaning higher frequency) X-rays to penetrate deeper. The stuff I've read online about XRF technology suggests that it reaches a few hundred microns (or a few 0.1mm increments) into a dense metal surface like gold, silver, copper, lead. A U.S. cent is about 1.5mm thick. Could it reach the interior? On paper, maybe. I wouldn't bet $10000+ of my own money on that assumption. I would want to see a battery of tests on a control group, first, with multiple variations.

However—and it's a big however—most measurement techniques that rely on EM reflection are probably heavily biased towards the surface if the metal structure is non-uniform. I think it's a bit concerning that the planchet doesn't read as the proper pre-1982 copper alloy composition, because a vintage planchet would be a uniform metal alloy from the surface straight through the core.

Having been involved in testing semiconductors, I would have imagined that they would have run a series of tests on that coin. Specific gravity is the first one that comes to mind, followed by mechanical parameters like diameter and thickness, and then conductivity and electrical tests.
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LilyBug18's Avatar
United States
17 Posts
 Posted 02/04/2026  4:43 pm  Show Profile   Bookmark this reply Add LilyBug18 to your friends list Get a Link to this Reply
The coin was tested several times by different organizations: once by myself, PCGS, NGC, back to PCGS. I have the original testing results from PCGS; I have the original testing results from NGC, and again by PCGS. It's just printed on the label of the holder. It's a pretty straightforward test, not so simple of a process, but after being done multiple times, if there was any sort of discrepancy or miscalibration, then it would have become obvious through the multiple tests.
And aside from that, when I originally sent the coin to PCGS the first time, it was labeled Mint-State 64 red, and something happened at NGC that caused oxidation and turned it red-brown, which then PCGS labeled it red-brown. They probably added some solution to the surface that would give them some indicators; I don't know, but that is a big shift in color, and I never took it out of the holder after receiving it back from PCGS initially after I goofed on the submission forms, which was a pain, let me tell you. I thought I was updating the submission form rather than sending it in as a whole new submission, lol. But at least it's straight graded initially, which was good news. If there was some sort of discrepancy with the design that would have made it apparent that the coin was manufactured by an individual, that would have been a big letdown, you know? I can't believe there is even a discussion about what this coin is after it went through the tests that it has. #128557;
Pillar of the Community
United States
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 Posted 02/04/2026  4:44 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list Get a Link to this Reply
A specific gravity test would arguably be more useful in these circumstances as zinc has a significantly lower density than copper. Even a heavy layer of copper plating wouldn't obscure this.
Error coin writer and researcher.
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LilyBug18's Avatar
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 Posted 02/04/2026  5:04 pm  Show Profile   Bookmark this reply Add LilyBug18 to your friends list Get a Link to this Reply
I wouldn't be against taking that bet, but I completely understand. Honestly, I do. What's been happening in the coin community ever since I realized there was one has opened my eyes to all of the fraud. There is an enormous amount of fraud, deception in this world, let alone strictly in the numismatic community. And honestly, if it wasn't for the applicable tests that I would, I would be looked at like every other individual who has made such claims.
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LilyBug18's Avatar
United States
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 Posted 02/04/2026  5:17 pm  Show Profile   Bookmark this reply Add LilyBug18 to your friends list Get a Link to this Reply
Yeah, a density test could be possible, but not as accurate as x-ray fluorescence, not by any stretch. Tungsten is used in the manufacture of counterfeit gold coins, and as far as density goes, from what I understand, it's identical if not almost identical.
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