Watch List notes:

Mexico City, Mexico, 4 reales, Charles-Joanna, "Late Series," assayer G to right, mintmark M to left (M-G), NGC AU details / cleaned / Golden Fleece (ca. 1550). Nesmith-50d; Cal-127; S-M5; KM-18. 13.44 grams. Very broad flan extending past the full legends in places, choice full central details, very lightly toned and virtually corrosion-free. From: "Golden Fleece wreck," sunk ca. 1550 in the Northern Caribbean
($600-900)