Came across this chip, and I'm betting there aren't many out there...I could be wrong, though:)

It reads:
"Horseshu Casino"
"No Cash Value"
"Jackpot, NV"

I was told it was a training chip (I got it from a long former dealer from there) It's green, and the letters are gold. I have been trying to post a picture, will get one up later tonight.