Watch List notes:

Potosi, Bolivia, cob 8 reales, Philip IV, assayer not visible (ca. 1645). KM-19a. 21.34 grams. Very underweight and clearly low in fineness (by color), nearly full shield with bold denomination 8, incomplete cross due to flatness and doubling, deeply toned About Fine, a perfect example of the kind of "mint scandal" coin that disrupted economies around the world and prompted a royal investigation, recall, countermarking and eventual change of design.

Estimate: $100 - 150