100 Rials

The P#135 series was introduced after the 1979 revolution required a systematic overhaul of Iranian currency — existing notes carried imagery of the Shah, making them politically untenable. That De La Rue in London continued printing for the Islamic Republic in the early 1980s, despite the dramatic rupture in Iran's Western relationships, reflects how few alternatives existed for high-quality intaglio banknote production at the time.

The watermark is the sole security feature — modest by the standards of what De La Rue could produce, suggesting either cost constraints or a deliberately abbreviated specification from the issuing authority.