Watch List notes:

Potosi, Bolivia, cob 1/4 real, Philip II, assayer B to left (2nd period), mintmark P to right, rare. S-P6; KM-B1; CT-770; Janson-6.3.1. 0.83 gram. Full castle and lion and much bold legend, full B-P (the B broken on the bottom, making it look a little like an R), VF with contrasting toning, among the finest known. Pedigreed to our Auction #16, lot #598.

Estimate: $500