Philip III inherited the Potosí mint at its most chaotic. The cerro rico was producing silver at a scale that distorted European monetary systems, yet quality control on small-denomination cobs was essentially nonexistent — assayers were routinely bribed, and the fineness scandals that erupted formally in 1649 under Philip IV had roots reaching back into exactly this period. Half-real cobs were the denomination most likely to be clipped and re-spent without detection, making surviving examples of correct weight genuinely useful as period documents.
Philip III inherited the Potosí mint at its most chaotic. The cerro rico was producing silver at a scale that distorted European monetary systems, yet quality control on small-denomination cobs was essentially nonexistent — assayers were routinely bribed, and the fineness scandals that erupted formally in 1649 under Philip IV had roots reaching back into exactly this period. Half-real cobs were the denomination most likely to be clipped and re-spent without detection, making surviving examples of correct weight genuinely useful as period documents.