Hi Wiliam, nice to read your post. Interesting subject [[;)]]
The contrabass saxophones I did see live and in pictures, went only to low B natural (written), and not Bb as other saxophones normally do. This would be D natural (0 VSL), because the Instrument is in Eb -Soprano=Bb / Alto=Eb / Tenor=Bb / Bariton=Eb / Bass =Bb / Contrabass = Eb -. But of course it is not excluded that there are some in existence build to go down to Bb.
Iwan
The contrabass saxophones I did see live and in pictures, went only to low B natural (written), and not Bb as other saxophones normally do. This would be D natural (0 VSL), because the Instrument is in Eb -Soprano=Bb / Alto=Eb / Tenor=Bb / Bariton=Eb / Bass =Bb / Contrabass = Eb -. But of course it is not excluded that there are some in existence build to go down to Bb.
Iwan