To get a concert C I have to finger a Bb on this horn (should be A).
That puzzles me, as since I've owned it I thought it was an alto, presumed to be an Eb instrument. Note: I'm not a sax player, haven't touched this in decades.
MYSTERY SOLVED: I wasn't pushing the mouthpiece on far enough!
But maybe my mouthpiece's opening is too small, going to try a new one. Sid the repair man was certainly able to get his to the right place.