I had always thought these Las Vegas promo tokens listed all the major casinos open when they were minted. In looking at your nice big scan though, I see several downtown clubs missing:

Golden Gate
Golden Nugget
Nevada Club
Lady Luck
The Mint (closed in 1988)

Also, Mirage (1989, so maybe too late)

Do you suppose they had to pay to get their name listed?

Anyone else see a name missing? The Marina which is listed was open 1975 to 1999, to give a time frame.