Kevin,
Great find!
This is a great old classic chip. I have to correct you & others who say it is R-6. It is a Rarity 5 which is 76 to 150 known in my Official US Casino Chip Price Guide, 2nd edition that I authored. Value mint I book this at $450. A bit high, but now it all changes anyways. The first few on ebay should bring the most then they will go down from there especially if you run them one after another.
Your find is greater in that now those who had these chips drilled can now upgrade to a nicer example.
I have never seen the Hilton chips. Odd in that they do not have a number or letter for a roulette chip so for now are just a no value chip. A chip the casino would of assigned a value to.