I worked for Coca-Cola when they did the "MagiCan" promotion back in 1990. It would "Pop Up" cash prizes of a real $1 to $500 bill or one of a number of vouchers for other stuff. Maybe this is a knock-off of that promotion. Could this be from the "Not-So-Magic-Coin-In-The-Bottle-Cap" promotion by some lesser soft-drink company? Nah. I'm just amazed that someone put this on eBay!
"Shine, shine, a Roosevelt dime All the way to Baltimore and running out of time" - Tom Waits 'Clap Hands'