Watch List notes:

Mexico City, Mexico, cob 4 reales, Philip III, assayer D, Grade 1. S-M18; KM-37.2. 12.45 grams. Solid and largely uncorroded, with clear assayer, full shield and cross, typically silvery. With Fisher certificate #191320. Recovered from: Atocha, sunk in 1622 west of Key West, Florida ($500-750)