Cuba
Republic platinum "40th Anniversary" Proof 500 Pesos (1 oz.) 1993 PR67 Ultra Cameo NGC, KM605var. Deeply cameoed with choice surfaces. Perhaps in error, the Standard Catalog of World Coins lists the 500 Pesos issue of this date as a 5oz platinum coin instead of the 1oz weight seen here.
Estimate: 5000-6000 USD