Montenegro
Nicholas I gold "Golden Jubilee" 20 Perpera 1910 MS61 NGC, KM11. A one-year type issued in commemoration of Nicholas I's 50th anniversary of his reign.
https://coins.ha.com/itm/montenegro/montenegro-nicholas-i-gold-golden-jubilee-20-perpera-1910-ms61-ngc-/a/3091-32718.s?type=CoinArchives3091
HID02906262019
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Estimate: 800-1000 USD