Denier - Philip III Barcelona, B countermark

Philip III inherited a Catalan monetary system perpetually at odds with Castilian fiscal ambitions. The Barcelona mint operated under strict privileges of the Principality, meaning Madrid could not simply dictate recoinage — Catalan coinage required negotiation with the Corts. The small "B" countermark applied to these deniers was a revalidation mark, stamped to authenticate coins for continued circulation during periods when debased or counterfeit petty coinage had flooded Catalan markets. Without the countermark, the piece was effectively demonetized.

Countermarking rather than recalling and restriking was the cheaper administrative solution for a cash-strapped crown managing a restive province.