Spain. Carlos III. 8 Reales Acuñados en ceca de Ciudad de México (Mo), 1773. Ensayador F·M. (No reserve price)

The 8 Reales coin minted in 1773 at the Mexico City mint (indicated by the 'Mo' mark) during the reign of Carlos III is a classic example of Spanish colonial coinage. Known colloquially as the 'piece of eight,' the 8 Reales was a widely circulated silver coin used across the Spanish Empire and beyond, serving as a de facto global currency in the 18th century. The coin bears the monogram or marks of the assayer F·M, responsible for quality control at the mint. These coins represent a critical period when Spain's wealth from the Americas fueled European economies. The design typically features the Spanish crown, shield, and royal inscriptions, reflecting Carlos III's reign noted for economic reforms and strengthening the empire. Collectors treasure 8 Reales for their historical importance, silver content, and role in global trade, making this coin an enduring symbol of colonial and monetary history.