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Had one of these for a while last year. It was a very fun Alexander from the 1950's. Great sound, fun to play, but I just wasn't up for the commitment to the odd fingering system. The bits I got comfortable with, though, the fingerings flowed very naturally.

Are you sure this is a Vienna Model ? Look at the top valve and the way it sits slightly removed from the rest of the valve block. Meinl Weston or Mirafone F tuba?