500 Rials Islamic Republic

The 500 Rial note is one of the lowest-denomination printed notes still in circulation during this period — worth a fraction of a US cent by the mid-2000s, a direct consequence of the sustained inflation and exchange rate collapse that followed the 1979 revolution and the economically devastating 1980–1988 war with Iraq. At this value, the note was functionally approaching irrelevance even while still being printed.

Thomas De La Rue's continued role as printer is notable given the US-led sanctions regime of the era, though Iran maintained various European banking and printing relationships well into the 2000s. Four signature combinations across the series reflects genuine ministerial turnover rather than any single political rupture.