Watch List notes:

Mexico City, Mexico, cob 4 reales, (1)624/3D, rare. S-M18a; KM-unl (38 for type). 13.18 grams. Full and bold oMD, clear 624/3 of date with the 2 actually a retrograde z, good centers but peripheries flat, no corrosion, square flan with the four points blunted at the mint. Recovered from: "Lucayan Beach wreck," sunk ca. 1628 off Grand Bahama Island
($200-300)