France
Louis XVI bronze Essai 6 Deniers 1790 MS63 NGC, KM-Unl., Maz-183 (R2), Guilloteau-143. Liberté Constitution Patrie (incuse) on edge. An apparently quite rare Essai type from the Constitutional Monarchy, produced on an extra thick flan which Mazard states was part of a program for private industry to manufacture a new series of test blanks. Entirely missing from the Carl F. Chirico, Jr. Collection of World Patterns offered in 2008, we have been unable to locate a specimen coming to auction in at least the last two decades.
https://coins.ha.com/itm/france/france-louis-xvi-bronze-essai-6-deniers-1790-ms63-ngc-/a/3088-34437.s?type=CoinArchives3088
HID02906262019
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Estimate: 800-1000 USD