Here are 4 different aluminum, dollar-size, free play, slot machine tokens from 4 different mints. I believe these tokens were given out to entice visitors to sign up for the Mint's Players Club and were used on special slot machines at the Player's Club booth. Those machines were in a bank of 6 or 7, larger format machines (wider), using these "ExciteMINT!" belly glass sheets and those aluminum tokens.

Jim