50 Soles de Oro

By 1975, Peru was under the military government of Juan Velasco Alvarado — or more precisely, his successor Francisco Morales Bermúdez, who took power in August that year. The BCR had been issuing this De La Rue-printed series since the late 1960s, and the 50 Soles denomination sat at a mid-range value that was eroding fast. Inflation through the mid-to-late 1970s was severe enough that the entire Soles de Oro system would eventually be replaced by the Inti in 1985.

Thomas De La Rue's involvement kept production quality consistent across the series, with the watermark remaining the sole mechanical security feature — modest even by the standards of the period.