Delhi Sultanate, Turk Dynasty, Nasir-ud-din Mahmud (AH 644-664/1246-1266 AD), Hadrat Delhi Mint, Silver Tanka, Obv: sultan al azam Nasir ud dunya wa'l din abu'l muzaffar Mahmud ibn sultan, Rev: fi ahd al imam al-must'asim, mint name & date in margin, 10.90g, 26.27mm, (G&G # D137), about very fine.