100 Escudos

The Banco de España's 1868 issue predates the Peseta system by just one year — the escudo had been Spain's decimal unit since 1864, replacing the old real-based system, and this note belongs to the brief window when that reform was still in effect. The transition was short-lived: the Peseta was introduced in 1869 as part of the Latin Monetary Union framework, rendering escudo-denominated notes obsolete almost immediately.

The 1868 revolution — the Gloriosa — deposed Isabella II in September of that year, adding political turbulence to monetary. Notes issued across 1868 may predate or postdate the coup depending on exact issue date, a detail worth establishing if provenance matters.