4 Real Mexico

The 4 Real coin from Mexico was struck using silver from mines like those in Zacatecas, often resulting in alloys that varied subtly in fineness and left modern analysts scratching their heads.

That variability wasn't just a minting quirk. These coins circulated widely in colonial trade, from the ports of Veracruz to the Manila Galleons bound for Asia, helping fuel the global silver economy for over a century and a half.

Records of exact mintage figures are spotty after the 1838 fire in Mexico City archives, so we can't pin down precise numbers for most years. What we do know is that designs shifted with political winds—from Spanish busts under Charles III to the Republic's eagle after 1821.

Assayers' marks on these pieces can tell a story, if you're patient enough to decode them. They didn't always get it right, mind you.