100 Nuevos Pesos

Uruguay's 1975 monetary reform introduced the nuevo peso at a rate of 1,000 old pesos to one — a redenomination that reflected roughly a decade of accelerating inflation under increasingly authoritarian civilian and then military governance. The junta that had taken full control in 1973 was still consolidating its economic management when this series entered circulation, and De La Rue's involvement was part of a broader continuity with earlier Uruguayan note contracts rather than any new arrangement.

The watermark remains the sole security feature, which by the mid-1970s was already considered minimal for a high-denomination issue.