Bengal Sultanate, Ghiyth ud-din A'zam Shah (AH 792-813/1389-1410 AD), Hadrat Firuzabad Mint (Style), Silver Tanka, Obv: Arabic legend "Ghiyath ud dunya wa'l din abu'l muzaffar A'zamshah ibn Sikandar Shah ibn Ilyas Shah al-sultan" in quarterfoil, ruler's tile in margin, Rev: Arabic legend "Nasir amir al-mu'minin ghawth al-islam wa'l muslimin khallada mulkahu" within a circle, mint & hijri year off flan in the margin, 10.7g, 30.00mm, (G&G #B242), superb luster, graded by NGC as MS 64, Rare in this grade.