Watch List notes:

Potosi, Bolivia, cob 4 reales, 165(0-1)O, with unidentified countermark on shield. S-P35; KM-17b. 8.36 grams. Thin from corrosion but with nice full crown over full shield with weak countermark, nearly full cross with bold 16 of date, toned all over. With Marex tag #91-4R-0656. Maravillas, sunk in 1656 off Grand Bahama Island

Estimate: $300-450