Sultans of Bengal, Silver tanka of Nasir al-Din Mahmud (1433/4-1459 AD), no mint, AH 847, probably G&G B424, 10.64g. Obv: Arabic legend in decorative border nasir al-dunya wa al-din abu al-muzaffar mahmud shah al-sultan. Rev: Arabic legend in decorative border ghauth al-islam wa al-muslimeen khallada mulkahu with AH date. Very fine, Very scarce.