Nasir Shah, Silver Square Tanka, 10.94g, “Mihrabi Decoration” type, AH 913, Obv: nasir shah al khalji bin Ghiyath shah within square with mihrabi decoration, Rev: al sultan khallada mulkahu within square as on obverse (G&G# M114). Very fine+, extremely rare.This Mihrabi decoration type seems to have been an initial tanka issue in year 913 before the final design was chosen and issued later in that year.