Watch List notes:

Mexico City, Mexico, cob 4 reales, Philip IV, assayer D. S-M18a; KM-38. 13.32 grams. Choice example with well-detailed full shield and cross, clear assayer D, typical peripheral flatness, no corrosion. From: "Lucayan Beach wreck," sunk ca. 1628 off Grand Bahama Island
($200-300)