Bengal Sultanate, Nasir Al-Din Mahmud Shah (AH 837-864, 1433/34-1459 AD), Silver Tanka, 10.71 gms, Arsah Chatgaon Mint, AH 848, Obv. Nasir al dunya wa’al dun Abu’al Mujahid mahmud shah al sultan date & mint name in margin, Rev. al-mujahid bi-ta’yid al-rahaman khalifat allah bi;al hujjat wa’al Burhan, G&G #B410, about very fine, very rare.