Watch List notes:

Potosi, Bolivia, bust 4 escudos, Charles III, 1778PR, encapsulated NGC AU 58 (only specimen in NGC census), very rare first date. KM-58; CT-362. Light orange toning with muted underlying luster, nice strike, so rare that this is the only specimen slabbed by NGC (therefore finest on record), very popular as the first date of Potosi gold, with low mintage of 944 pieces only.

Estimate: $12500