Yes, the one with two dots on the Las Vegas sign side is the rarer one. Two dots meaning two dots on each side, so really four dots...

You can also tell because the words McCarran Slots on the rim on the picture side is in large font on the 2 dot version. On the one dot version it is a smaller font.

Sorry for answering, I know Kirk will now again say I have all the answers. But I figured I would try to help anyways.

Dave.