France
Napoleon III Mint Error - Obverse Lamination gold Proof Essai 25 Francs 1867 PR62 NGC, Paris mint, KM-E29, Maz-1746. By Barre. This dual-denominated Pattern from the "Essai Monetaire" series was produced as part of the international currency test, performed at the monetary conference in Paris in 1867. The offering carries the clear traits of a Proof issue, including shimmering surfaces bordered by sharp rims, complemented by an equally strong strike. The lamination error refers to a small area near the back of Napoleon's bust, small enough to be of academic intrigue, though certainly not so large as to be distracting.
https://coins.ha.com/itm/france/france-napoleon-iii-mint-error-obverse-lamination-gold-proof-essai-25-francs-1867-pr62-ngc-/a/3075-32160.s?type=CoinArchives3075
HID02906262019
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Estimate: 8000-10000 USD