Potosi, Bolivia, cob 4 reales, Philip IV, assayer not visible (style of assayer O, 1649-50), with crowned-dot-F-dot countermark (2 dots) on shield. S-P35; KM-17b. 13.01 grams. Decent centers but flat peripheries, the countermark oddly near edge, no corrosion, toned in crevices. With Marex tag #91-4R-0417. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island (Estimate: $350 - 500)