Chittagong region Trade Coinage, in the name of Islam Shah Suri, Silver Tanka, 10.56g, AH 957, Obv: islam shah sultan ibn sher shah sultan khallada allah mulkahu wa sultanahu, Devnagari legend below, Rev: Shahada, below ghawth al islam wa’l muslimin (G&G# B1001). Test mark on reverse otherwise very fine+, very rare.