Watch List notes:

Bengal Sultanate, Nasir ud-din Mahmud (AH 837-864/1433/4-1459 AD), No Mint, Gold Tanka, Obv: Arabic legend "Nasir ud-dunya wa'l din Abu'l Muzaffar Mahmud Shah al-sultan", Rev: Arabic legend "al-mu'ayyad bi-tayid al-rahman khalifat allah bi'l hujjat wa'l burhan", 10.7g, 20.05mm, (G&G # B405), about very fine, Very Rare.