Maybe this won't help, but I have a couple of Buescher Aristocrat tenors and all the same altissimo fingerings that work on my MKVI also work on the Bueschers. So I don't think there is anything unique about the Bueschers in terms of altissimo fingerings. Of course, you might find certain fingerings you prefer. But whatever you use on other tenors should work on the Buescher. Caveat: That's just my experience, though.
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