Bulgaria
Ferdinand I copper Essai 10 Santim 1887-A.B. MS63 Brown NGC, Brussels mint, KM-E3. Mintage: 8. A significant rarity within the 19th-century Bulgarian series, with the Standard Catalog of World Coins recording a production of just 8 pieces.
https://coins.ha.com/itm/bulgaria/bulgaria-ferdinand-i-copper-essai-10-santim-1887-ab-ms63-brown-ngc-/a/3082-33415.s?type=CoinArchives3082
HID02906262019
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Estimate: 800-1000 USD