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At the last Paris show something amazing and unusual occurred. That was the discovery of two error coins by PCGS staff. Even more unusual was the significance of the errors and that it was on a new gold bullion issue, which usually has very strict quality control.
In the PCGS office in Paris, we will often get bullion for certification from across Europe. This bullion can range from vintage to modern issues. One submitter got very lucky with submitting a new Great Britain bullion coin struck at the Royal Mint. The coins were submitted in their original rolls, and it's from there that a PCGS receiver noticed two of the coins were very different. What the PCGS receiver had found was a rare mint error.
The mint error was caused when two planchets, instead of the normal one, had gone into the press and got struck together. What occurred was a striking error in which one coin featured the obverse and a brockage effect on the other side, while the other coin featured the reverse design and a counter-brockage.
Mated pair error coins like this are incredibly rare. Even rarer is that it occurred on Great Britain 2026 £25 gold issues commemorating the Royal Tudor Beast, which features the Queen's Lion.
After the discovery of the mint error, the submitter was notified and given the option of using a PCGS dual holder for encapsulation to keep the mated pair together. The submitter agreed and the coins were certified as such. While there are always interesting coins at the PCGS Paris office, this discovery was a highlight of the show.