Here is a picture of four different layouts for the Harrahs Reno/Tahoe ENTERTAINER matchcover. I've found each of these in both red and pink colors. There's also the Standard of Excellence cover that looks the same on the front but that I have seen only in red. All these say "The world's GREATEST Entertainers APPEAR AT Harrah's" on the front and have the American Match Co. Reno NV manumark. I'd guess 1960s or early 1970s for these but maybe somebody can date them better using the demise of one of the headliners?

If anyone has other varieties listing different entertainers or different colors, I'd like to hear about them. I have a couple of traders of these if you need a particular one.