Casting was not a mode of production during this period for silver. The original was issued by Islam Shah ibn Sher Shah Suri who ruled from 1545-1554. It should be a rupee of his standard (11.6 g). The size on these varies from 19-24 mm. The Suris ruled in Southern Afghanistan, the Punjab and as far as the Ganges.
Wikipedia has a passable article on the Surids.