MEXICO. Cob Real, ND (1556-98)-M O. Mexico City Mint. Philip II. PCGS AU-53 Gold Shield.
Cal-Type 88#224. A well struck shield-type Cob with clear name of king, mintmark, and assayers' initial. Note the "M" for Mexico City does not have a small circle above. Coin is toned gray with some color in the peripheries.
Estimate: $200 - $300