Watch List notes:

Potosi, Bolivia, cob 8 reales, 1750 q, rare. S-P50a; KM-40; Cal-512. 17.74 grams. Corroded with some pillars side detail still visible, a few spots of black encrustation, very rare provenance to a fifth rate frigate of the British Navy. With original (generic) certificate from the salvor. From: HMS Assurance, sunk in 1753 off the Isle of Wight, south of England
($200-300)