I'd guess that as well, I wonder if that 2nd bell is closed off at the attachment point so that only the original sax plays. Otherwise it creates an alternate air exit that presumably would significantly alter the effect of the bell keys on the first bell. But then they wouldn't need that single arm that presumably holds the pad on the 2nd bell closed.Hmmn. I don't see any linkage to the second bell keywork. Wonder if it was just some custom thing more for the visual novelty. Maybe for some kind of circus act?