Superba II soprano

[Lenny]

How good are the superba II sopranos?
Are they the same as the SX90's?
I assume they would only be 1 piece.
Does serial # make a difference.
What is the aprox value if in good condition?
Thanks I have a possible lead on one. It would be a backup for my black SX90II.

[T.S.]

I owned a Superba II sop back in the 70's. It sounded great, but had the MKVI style left hand palm keys, and I found that to be a total pain.