That is a great piece of History, I am a big Fan of Cisero Murphy and I wish I could have seen him play in person. Due to the association to Cisero, and the letter of authenticity the cue would certainly be a very very high end cue even in this market, but at auction it would depend on how many people with big pockets want the cue.
But, there is also a problem with the article the cue could not have been Balabushka's third cue made. In 1959 George made a number of cues for his friends, and by the time frame given in the article that states when this cue was made George was already building cues full time. So I don't know what they mean by third cue made unless they were talking about the third cue for a famous player.
Take Care