Bengal Sultanate, Nasir Al-Din Mahmud Shah (AH 837-864, 1433/34-1459 AD), Gold Tanka, 10.83 gms, mint Al Firuzabad Obv: ruler's titles,beginning al-sultan al-adil with abul-mujahid Rev: Arabic legend al mu'ayyad bi-ta'yid al-rahman khalifat allah bi'l hujjat wa'l burhan unpublished in G&G, similar to silver rupee G&G B416 A, very fine, very rare.