4 Soles Provincias del Rio de la Plata

La Rioja's silver coinage of the 1820s emerged from the chaotic provincial minting that followed Argentine independence, when Buenos Aires' attempts to centralize monetary authority repeatedly collapsed against the resistance of interior provinces. La Rioja operated its own mint largely because it had to — federal coin simply didn't reach it in usable quantities. The 1828 date falls squarely within the civil conflicts between Unitarians and Federalists that would eventually consume the province entirely.

CJ#39 distinguishes this emission within a series notorious for crude workmanship and irregular planchets. Die alignment and striking pressure varied batch to batch at La Rioja, so expect inconsistency as the norm rather than a flaw.