Del Webb's Sahara Reno was licensed from July 1, 1979 to Dec 29, 1981. HIlton bought the place in December of 1981 and rebranded it as the Flamingo Hilton. As to the value - very hard to determine - even vary rare glasses don't fetch too much - just not enough hard core collectors to drive the prices too high. I have this cool tray that looks like it was made from a slot glass - no idea of its value either. Interesting - the tray shows an Apr 1979 Grand Opening but Kling's book says the license was issued on July 1, 1979.