Watch List notes:

Mexico City, Mexico, 4 reales, Charles-Joanna, "Late Series," assayer A to right, mintmark M to left (M-A), encapsulated NGC AU 58. Nesmith-58 type; CT-79; S-M6. 13.5 grams. Lustrous and rainbow toned, full details, tiny edge-split. From the "Golden Fleece" wreck (ca. 1550). (Estimate: $600 - 900)