Mexico City, Mexico, 4 reales, Charles-Joanna, "Late Series," assayer A to right, mintmark M to left (M-A), encapsulated NGC AU 55. Nesmith-58 type; CT-79; S-M6. 13.1 grams. Crisp details (more like UNC), slightly off-center strike, richly toned all over with underlying luster. From the "Golden Fleece" wreck (ca. 1550). (Estimate: $600 - 900)