This coin was produced under Alonso de Villaseca (1546-47), the third assayer of the late series. Recovered from the “Golden Fleece” shipwreck sunk circa 1550 with all Mexican coins predating Rodrigo Gómez de Santillán (Assayer S), who began his appointment in 1553.
Reference article: https://www.sedwickcoins.com/articles/carlosyjuana.pdf
Mexico City, Mexico, 4 reales, Charles-Joanna, “Late Series,” assayer A to right, mintmark M to left (M-A), NGC XF 40. Nesmith-58 type; Cal-131; S-M6; KM-18. 13.50 grams. Nicely broad flan with virtually full legends, super-crisp full pillars-and-waves, the shield side also full and with bold M-A but with trace of surface oxidation, dark gunmetal toning.With Sedwick photo-certificate. Recovered from: “Golden Fleece wreck,” sunk ca. 1550 in the Northern Caribbean .
Please use this link to verify the certification number: https://www.ngccoin.com/certlookup/4447514-003/40/
