Latvia
Republic nickel Essai 10 Santimu 1922 MS65 NGC, Huguenin mint, Le Locle, KM-Unl (cf. KM4). An extremely rare Essai, apparently unpublished in the Standard Catalog of World Coins and struck in the same metal as the adopted design, with the addition of an "HF" (for Huguenin Freres) monogram in the upper right field of the reverse.
https://coins.ha.com/itm/latvia/latvia-republic-nickel-essai-10-santimu-1922-ms65-ngc-/a/3088-34996.s?type=CoinArchives3088
HID02906262019
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Estimate: 1000-1200 USD