Cuba
Republic silver Proof Prueba "50th Anniversary of the Central Bank of Cuba" 10 Pesos 2000 PR69 Ultra Cameo NGC, Havana mint, KM-Unl. (cf. KM761 for standard type). An apparently unpublished pattern type, struck to an unknown mintage, though certainly quite rare.
https://coins.ha.com/itm/cuba/cuba-republic-silver-proof-prueba-50th-anniversary-of-the-central-bank-of-cuba-10-pesos-2000-pr69-ultra-cameo-ngc-/a/61180-99010.s?type=CoinArchives61180
HID02906262019
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Estimate: 300-400 USD