10 Euros 8 Reales of Carlos IV

The original 8 reales — the coin this piece commemorates — was the first globally traded currency, minted continuously from the 1490s through the 19th century and accepted as legal tender in the United States until 1857. Carlos IV's reign (1788–1808) coincided with the peak of Spanish colonial silver output from Potosí and Mexico City, though his rule ended with his forced abdication under Napoleon's pressure at Bayonne.

The Real Casa de la Moneda has issued several reales-themed commemoratives; this 2017 entry in that series reproduces the milled edge and macuquina-era aesthetics that made the original so resistant to clipping fraud.