I'm wondering if this is one of the first matchbooks from the Horseshoe. It does not say Binions anywhere, but does say Eldorado Corp., which I assume is who Benny Binion bought the Shoe from. Eldorado opened in 1947 and Binion bought it in 1951. Anyone know when the name went from Eldorado to Horseshoe? Any info greatly appreciated. Thanks, Doug.