Watch List notes:

Potosi, Bolivia, cob 1/2 real Royal, 1686, very rare. S-P40; Janson-R32.20; KM-unl.; CT-unl. 1.57 grams. Broad, round flan with full inner details (monogram, cross and two dates), some legend (including 16 of third date) despite peripheral truncation and flatness, darkly toned AXF with hole near edge. Pedigreed to the Santa Rosa de Lima collection and to the Ponterio auction of April 1997, with original lot-tag #2430.

Estimate: $350