In a quick search of Zeno and
coinindia.com I didn't find any matches to these coins, though it might be worth further searching.
The first bust is similar to Menander I Soter but the reverse is different and the coin listed weighs only 13.3 g.
http://coinindia.com/galleries-menander.html
I would be cautious because there are many forgeries of Indo-Greek coins around.
