Bengal sultan, Coin Struck in the name of Nasir Al-Din Mahmud sultan of delhi by Lakhnauti Mint, (AH 644-664/AD 1246-1266), Silver Tanka, 10.7g, 658 AH (Date Unlisted in G&G), obv: caliph al-Musta’sim but the word shah is omitted from the bottom line, G&G B71, NW 225C, Extremely Fine+ with complete mint and date in a Beautiful Condition and Broad Flan, Extremely Rare.