Bengal Sultanate, Nasir-ud-din Mahmud (AH 837-864/ 1433/4-1459 AD), Dakhil Banjaliya Mint , Silver Tanka, 'Seven circle' type, AH 854, Obv: Nasir Shah in 4 circles, al sultan in 3 circles, Rev: in lotus-shaped cartouche ghawth al-islam wa’l muslimin, hijri date and mint name at bottom, 10.50g, 24.00mm, (G&G # B470, plate specimen), choice very fine, Exceptionally Rare.