50 Réis - João IV Countermarked 2 Vinténs

João IV died in 1656, leaving Brazil's colonial coinage in administrative limbo during the regency that followed. The countermark authorizing these pieces for circulation at 50 réis was applied to existing 2 vintém coins — a practice that sidestepped the expense and logistical difficulty of striking entirely new issues in the colony. Portugal's monetary authorities relied heavily on countermarking throughout the seventeenth century precisely because purpose-struck colonial coinage remained chronically undersupplied relative to commercial demand.

The countermark itself is the coin's primary authentication point, and its clarity varies considerably across surviving examples.