Bengal Sultan, Nasir Al-Din Mahmud (AH 837-864/AD1433/4-1459), Silver Tanka, 10.74g, No Mint Type, With legends on reverse “khallada mulkahu wa sultanahu”, Similar to G&G B448 which is mentioned as crudely engraved but this coin is in fine calligraphy, both side decorative V border, Unlisted in G&G, Very Fine+, Extremely Rare.