Watch List notes:

Potosi, Bolivia, cob 1/2 real, Philip III, assayer not visible, Grade 3, extremely rare. KM-6. 0.61 gram. Nicely toned, with clear mintmark P to left and most of the bold Philip III monogram and cross in evidence despite some corrosion resulting in holes in the thin flan, so there is no question about this coin's denomination, which is THE ONLY ONE KNOWN from this wreck (with just one other recorded from the 1622 Fleet, a Mexico-mint example from the Atocha), fully certified, and therefore the only possible coin for completing a denomination set from this wreck or a Potosi denomination set from the 1622 Fleet. With Fisher tag and photo-certificate 82M-802. From: Santa Margarita, sunk in 1622 west of Key West, Florida
($500-1000)