Yes, I just checked my references and I am fairly certain they are
fakes.
The first coin is suppose to be of Eucratides. It shows a left facing
bust. It my references this seems to have come from only one
mint, Merv, but your coin has the
mint mark for Balkh.
The middle two are suppose to be of Pantaleon, but as far as I can tell he didn't issue this
type of coin. The
type with Zues holding
Nike came much latter and
had legends in a
circle instead of linear as on your coins.
The last one is suppose to be of Antimachos with the Balkh control mark of an N inside a
circle. The control mark is poorly done.
If real these coins should weigh around 16.96 grams.