Yes, I am afraid it is most likely a
fake. The closest I can come is a coin of Menader.
The reason why I think it is a
fake is the
weight. This is the most condemning piece of evidence. A
drachm should weigh around 2.4grams. A
tetradrachm should weigh around 9.7 grams. You coin is in between these
weights, and as far as I can tell no coin was made around 6 grams.
Finally, the
style is wrong for these coins, especially the
reverse. Instead of be a solid figure of
Pallas standing left, there should be lines that make up the figure instead of solid blocky objects. The
bust is too crude for this coin, especially the eye.