20 Pesos

Argentina's 2001–2002 financial collapse triggered a constitutional crisis that left the country cycling through five presidents in under two weeks. Provinces, unable to access frozen federal funds, began printing their own quasi-currencies to meet payroll and keep local economies moving. Mendoza's series — called "Petrobonos" informally, though the term wasn't universally applied — was among the more substantial provincial emissions, backed notionally by the province's petroleum revenues.

Casa de Moneda printed these under contract, an unusual arrangement that gave provincial scrip a degree of physical credibility it might otherwise have lacked. The notes circulated alongside federal pesos at par by local convention, not legal mandate.