Dave,
We are truly fortunate to have a Barry Szamboti or a Pete Tascarella.
Each of them know what an extreme responsibility they have authenticating a cue. Can you imagine their position when faced with a cue that someone paid many thousands of dollars for that turns out to be a fake?
There are a lot of tiny details that can't be faked. Gus shaped his own joint screws and Barry still has the tools he used to form them, that sort of thing. Gus had certain ways he did things that are small details that are different from other cue makers.
Aniother thing is, Barry helped his dad a lot in the shop, and was involved in his business early on. He made blanks and did a lot of work. Barry is reluctant to commit, one way or another, on authenticity. Gus did make some early cues with WICO and Titlist forearms, but Barry can even ID them.
So if he makes a statement like "it's not one of my dad's cues", well, my belief is it's not.
Is he perfect? Of course not. The real question is, would a serious collector gamble $7,000 on a cue he's says isn't a Szamboti?
Chris