5 Nuevos Pesos Overprinted on 5 000 Pesos

Uruguay's 1975 redenomination replaced the heavily inflated peso at a rate of 1,000 to 1, and rather than printing entirely new stock, the Banco Central ran existing 5,000-peso notes through Casa de Moneda in Buenos Aires to apply the "5 Nuevos Pesos" overprint. The arrangement was purely practical — Uruguay's own mint lacked the capacity, and the cross-border printing relationship with Argentina was already established.

The overprint seal doubles as a crude security measure, but counterfeit resistance was secondary to speed. Uruguay needed currency in circulation quickly as the new unit took effect under a military government that had suspended parliament two years earlier.