10 Soles

Peru's 1863 decimal coinage reform replaced the old real system with the sol, adopting a metric-compatible structure modeled closely on French decimal principles. The 10 soles sat at the top of the gold series and was pegged explicitly to the French 32-franc piece in weight and fineness, a deliberate alignment intended to facilitate trade with European partners during Peru's guano-boom years, when the country was flush with foreign credit and eager for monetary respectability.

The type had a short effective run. By 1872, fiscal overextension and the coming collapse of the guano economy pushed Peru toward paper currency, and large gold issues became increasingly impractical before the War of the Pacific ended the question entirely.