Single punchmark - large Srivatsa surrounded by circles and taurine symbols / Large punchmark in shape of fish surrounded by additional symbols. 12mmx14mm, 0.82 grams. Not in Rajgor's "Punch-marked Coins of Early Historic India" (might be a misdescribed Rajgor 409). 

Very rare double-sided coin - it seems to be an "elephant" type overstriking the "fish" type, without obliterating the old type. Very rare.

Surashtra was a one of the original Janapadas located in the Gujarat region (modern Saurashta). It was one of the last Janapadas to fall - it was annexed to the Mauryan Empire only during the reign of Chandragupta Maurya (ca.300 BC). The scarce coins of Saurashtra were quite different from most other Indian coins of those times - there were struck using a single die, and were usually restruck with a new design on one or more occasions, resulting in quite a mess, like the one seen on this coin.