Just found there are actually two variations of the 9th issue Club WINN slot card from the WinnaVegas Casino in Sloan, IA. The cards appear identical but in reality one variation is an EXTRA THICK plastic card that is almost double the normal slot card thickness while the second variation is a normal thickness plastic.
Here's a scan of the card I'm talking about. It's the card with the metallic gold band that goes all the way across the front from edge to edge. The next 10th issue card has a smooth gold band that doesn't go all the way to the edges.