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. 12.6 grams. Broad flan with full details, nicely toned with hint of luster, touch of corrosion near part of edge, hairline edge-split. From the "Golden Fleece" wreck (ca. 1550). (Estimate: $600 - 900)