This is a Silver Strike Rock Guitar Collectible - the $10.00 prize in special slot machines. There were several designs that were considered collectible items. They could be cashed in for $10.00. The coins are in plastic cases to protect them. It became a service nightmare, as the cases chipped, bouncing around in the machines... the fragments jammed up the works of the machines. There were usually 3 or 4 designs (keep playing until you win them all!), and designs were changed periodically, keeping collectors coming back.
These coins are .999 fine silver.
This chip features a drum set and guitar. The back shows the Hard Rock Hotel logo and guitar. On the back is the mint mark "G" for Global Minting.