Five punch-mark symbols (see below) / A single punch-mark (dot surrounded by arrows and crescents). Irregular flat silver planchet measuring 17mmx13mm, 3.25 grams. Gupta/Hardaker ISPC VI IV F 145 (#574).
The style is unusual - these coins are often debased, and might have originate at a mint other than Pataliputra.
Samrat Samprati was an emperor of Maurya dynasty who reigned from c.224215 BCE. He was the son of Ashoka's blind son, Kunala. He succeeded his cousin, Dasharatha as emperor of the Maurya Empire and ruled almost the entire present-day Indian subcontinent.
The Mauryan Empire was India's first great unified empire. It lasted from 321 to 185 BCE, and was ruled by the Mauryan dynasty. At its height it ruled virtually all of northern and central India and parts of Afghanistan and Pakistan.