I know it's unusual for a Casino to have a Backup $1 chip, but for some reason the MGM Grand did. In the new Price Guide it's listed as a R-8 with values of AVG 225, S-U 350, and NEW 450. It's also noted that only 10 of these $1 chips with the Blue Writting are known to be in collections. I believe The Chip Rack # is N4766.