20 Tomans

The Imperial Bank of Persia was a British-chartered institution — founded in 1889 under a concession granted by Nasir al-Din Shah — and held the exclusive right to issue banknotes in Persia for the entirety of its operating period. It was, in practice, a colonial banking instrument operating under Persian sovereign branding. The 20 Toman denomination sat at the high end of the series and would have seen limited day-to-day circulation given that most transactions in late Qajar Persia were still conducted in silver krans.

Bradbury Wilkinson printed the full series across a span of decades with minimal design changes, a common economy for low-volume high-denomination issues where plate longevity mattered more than visual refresh.