Mauryan Punch Mark Coin For ID

Based on the symbols that are clear, your coin should belong to Gupta & Hardaker series Vb defined as follows: "Probably the first issue of the Mauryan dynasty from c. 321 BC, this Series is tentatively divided into two subclasses, the first, chronologically earlier, is without additional Bold marks on reverse, the second has these marks." Unfortunately, the 5th symbol on the obverse isn't clear enough to assign a specific GH number. Series VI (the CNG coin) is associated with series but defined by a small flan and the arched hill (chaitya) symbol on obverse. Series Vi continues the bold reverse marks of series V.