Watch List notes:

Bengal Sultanate, Nasir ud-din Mahmud (AH 837-864/1433/4-1459 AD), Gold Tanka, 'Abul Muzaffar' type, Obv: Nasir ud dunya wa'l din Abu'l Muzaffar Mahmud Shah al-sultan, Rev: al-muayyad bi-ta'yid al Rahman khalifat Allah bil Hujjat wa'l burhan, 10.72g, 22.03mm, (G&G # B405), choice very fine, Extremely Rare.