I like third row, left the best, also the O in the logo is nice, like the other green coin logos
the only issue I have with it is that it looks a lot like a poker chip, at least it is one of the more expensive gambling chips, actually I don't really know, but I thought the green chips had a value of 1000, could be wrong about that though

It's giving a hint that there's a reeded edge to the coin , not necessary of course