Five punched symbols / Banker's mark. 21mmx11mm, 3.53 grams. Pataliputra mint. Mitchiner ACW 4197-4199; Gupta/Hardaker ISPC VI IV F 146 (#575).
The coin was struck in good silver, but has some copper deposits on the surface from being buried along with some copper objects.
Samrat Samprati was an emperor of Maurya dynasty. 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.