I've found this coin and I would like to identify it, and know it's approximate price. I believe that it is a tetradachm as it's matching size and weight.
I think that there is a head here, facing to the right, triangle neck at 7 o'clock, hair and back of the head at 9 o'clock, and nose at 3 o'clock.Horse facing left , pellet in amulet above.
I believe that it is one of these four, but I'm not sure, also because it isn't specified where are they from. I've found this one in Serbia, Srem county.