Bengal Sultanate, Nasir ud-din Mahmud (AH 837-864/1434-1459 AD), Chhatra (Umbrella) Type, Silver Tanka, 10.50 gms, Dar al Darb Mint, AH 858, Obv. Nasir ud dunya wa'al din Abu al Muzaffar Mahmud Shah al-sutan under Chhatra, Rev. gawth al islam wa-al muslimin khaldada mulkahu, G&G #B465, choice extremely fine for the type, extremely rare.