Watch List notes:

Potosi, Bolivia, cob 8 reales, (1)618T, upper half of shield transposed, Grade 2, with tag only (certificate missing). S-P21; KM-10. 24.52 grams. Full cross (partially flat) with bold full date, full but doubled shield (scarce error) with clear assayer to left and parts of king's name to right, minimal corrosion, toned. With Fisher tag #8609. Santa Margarita, sunk in 1622 west of Key West, Florida

Estimate: $250-375