8 Escudos - Carlos III

Carlos III's monetary reforms of the 1770s standardized gold coinage across the Spanish colonial mints, but Mexico City's output during 1786–1788 falls within a transitional period for the assayer marks — pieces from these years carry the FM assayer initial for Fernando Mangino, whose tenure was marked by administrative friction with mint officials over fineness accountability. The Mexican mint was simultaneously the highest-volume gold producer in the Spanish empire, yet quality control disputes were chronic.

KM#156a distinguishes this subtype from earlier Carlos III Mexican 8 escudos by the specific die arrangement standardized after 1771. Collectors should note the FM assayer pairing specifically, as die combinations vary across the three-year window.