Up for auction is this great looking Henri Selmer silver plated Saxophone mouthpiece that measures 3-3/4" long.  As far as "To    fit".  I had to use tenor since it was "Essential" to list it,  it would depend on what kind of Saxophone it is, either Alto or Baritone or Tenor or Soprano.   This is a really gereat looking mouthpiece.  Please see photos for detail & condition