Watch List notes:

Mexico City, Mexico, 4 reales, Charles-Joanna, "Early Series," assayer F to right, mintmark M to left (oMo-oFo), left-leaning panel, very rare. Nesmith-16; CT-73; S-M3. 11.98 grams. Broad flan with full AU details despite areas of moderate surface corrosion, clear assayer (rarest of the series), light toning here and there. From an unidentified ca.-1554 wreck off Santo Domingo, Dominican Republic.
(3500 - 5000 USD)