Here's what I believe to be the earliest, c. 1971 "Sharkey's" match-cover. "Nevada's Newest and Most beautiful 24-Hour Entertainment Center" Also interesting to note that this cover and a few others I have say "Sharkey's Nugget". However, the "Nugget" part is not reflective on any of the chips issued by this casino, except the $100 brass CIC, CG028507? We'll assume the "Nugget" was dropped at some point as everyone referred to it simply as "Sharkey's"
Eric