Watch List notes:

Santiago, Chile, bust 8 reales, Charles IV (non-transitional), 1791DA, encapsulated NGC AU 58, very rare, finest known in NGC census. KM-51; CT-736. Richly and beautifully toned all over, with subtle but original underlying luster, adjustment marks in centers but otherwise as close to perfect as you can get, even well centered and with full rims, rarest date of type (second only to the CRAROLVS and CROLVS errors of 1796 and 1800 respectively).

Estimate: $5000