Produced under Pedro de Espina (1538-1541), second assayer of the Mexico Mint succeeding Francisco del Rincón. Still less than 50 years after Columbus arrives in the New World and 5 years after the establishment of the first Mint in the New World in Mexico City. 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, “Early Series,” assayer P to right, mintmark M to left (oMo-oPo), plain circles, PLVS in rhomboid panel, NGC XF 45. Nesmith-26 for type/26; Cal-123; S-M4; KM-17. 13.40 grams. Later HISPANIARVM variety with a broad flan and nearly full legends, choice full castles and lions and pillars but with some minor peripheral corrosion and flat spots. 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/4427728-006/45/