Watch List notes:

Mexico City, Mexico, cob 4 reales, (16)21D, Grade 1. S-M18 12.58 grams. Bold oMD and clear 21 of date (rare thus), most of shield and cross despite flatness, very light corrosion only, good toning. With Fisher certificate #105081. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $600 - 900