In internet forums, there's something that's known as Godwin's Law:As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one (
Wiki reference).
The corollary point is that the person that brings up the comparison has just lost the thread.
I'd submit that the saxophone/woodwind version of this would be a Kenny G reference.
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I'm fairly sure that most people don't realize that saxophones have serial numbers -- hey, they're all sopranos, anyhow. Just like what Kenny G plays, right? I'd also be fairly certain that most police officers know that just about everything DOES have a serial number and if I was acting really suspicious-like, they'd search everything I have in my car.
I've also never seen a serial number rubbed off in such a manner that I'd think it wasn't intentional.
As for the buyer of the bari in question, I'd wonder what he was thinking buying the horn. Serial number's rubbed off? Other engraving's rubbed off? I'm gonna buy it from some kid? No problems!
I've had horns stolen, too.
Softening my original response, if this kid really did rub off all the identification from his horn because he was embarrassed by the thing, I wouldn't buy the horn from him or even bother trying it out. I just keep thinking that if this really was a "kid" thast did it, he's got a "friend" or school that's now minus a bari.