10 Pesos without 'LEY' on Obverse

Argentina's monetary system was under severe strain through the mid-1970s, and the note-issuing program struggled to keep pace with demand. The "LEY" designation on Banco Central notes of this period referred to the authorizing legislation — its absence on some 10 Peso examples from 1976 reflects a transitional printing run rather than an error per se, though collectors have long catalogued it as a distinct variety worth separating from standard issues.

Casa de Moneda in Buenos Aires handled the full production run. The omission went unannounced.