Bengal nawab, Siraj ud Daulah in name of Alamgir II. 1170AH/Ry3. Murshidabad mint. Very difficult to get the full dates on coins This coin had been issued during the time of Bengal Nawab Siraj ud Daulah as the period of RY 3 of Alamgir II was from 05/1756(08/1169) to 04/1757(08/1170). And the reign period of last independent Bengal Nawab Siraj-ud-Daula was 04/1756(07/1169) to 23/06/1757(05/10/1170). So the RY/date combination comes under the ruling period of Nawab Siraj-ud-Daula.