Watch List notes:

Potosi, Bolivia, cob 4 reales, 1650O, with unidentified countermark on cross. S-P35; KM-17b. 10.10 grams. Bold full P-O to left of full shield, full date outside of corroded cross with most of countermark, toned all over. With Marex tag #91-4R-0679. Maravillas, sunk in 1656 off Grand Bahama Island

Estimate: $350-500