Rukn al-Din Firuz, Silver Tanka, 11.02g, Delhi Mint, AH 633, Obv: Arabic legend “al-Sultan al-‘Azam Shams al-Dunya wa al-Din al-Sultan al-Mu’azzam Rukn al-Dunya wa al-Din Firuz Shah bin sultan” in rectangle, Rev: Arabic legend “Fi Ahd al-Imam al-Mustansir Amir al-Mumineen Fi Shuhur Sanah” followed by date in words; mint-name Dehli in top quadrant in circle and within a rectangle (G&G D90). Extremely fine, very rare.