MEXICO, Mexico City, 2 reales, Charles-Joanna, "Late Series," assayer O to right, mintmark oM to left (oM-O). Nesmith-109; S-M10; Cal-103; KM-12. 6.45 grams. Rare coin to be from a shipwreck (as "Golden Fleece" and 1554 Fleet are too early), typically cru