Watch List notes:

Potosi, Bolivia, cob 1/2 real, Philip II, assayer B to left (5th period), mintmark P to right, borders of x's, monogram side struck over shield side of a 1/4 real, unique. S-P14; KM-2.3. 1.59 grams. Broad flan with bold full monogram and B-P, full cross and crown, nicely toned AVF, with very clear and somewhat shocking error, especially considering how rare 1/4R of this period are (effectively the last 1/4R cobs ever made).

Estimate: $150 - 300