According to Dave Kessler, whose shop was an authorized B&S dealer,
the 2001 Series and Medusa were pretty much the identical horns.
This is how he described them on the Kessler & Sons website:

The B&S Series 2001 is the predecessor to the Medusa.
For the tenor sax, the body tube is the identical design to the Medusa.
There are only a few minor differences in key design.
Here are the few differences we have been able to identify:

Series 2001: Low C/D# Cluster 2 Separate Rods. Medusa (Series 2006): 1 Split Rod Mechanism.
Series 2001: LH C#-B Rollers are 2 Separate Rollers. Medusa (Series 2006) 1 Roller; 1 Tilting Connector Roller.

  • Bb Tenor Serial # ? Bb Tenor Serial # ?
  • Bb Tenor Serial # ? - Goldbrass Classic Bb Tenor Serial # ? - Goldbrass Classic
  • Bb Tenor sn 0155xx - Goldbrass Model SL Series 2006 Bb Tenor sn 0155xx - Goldbrass Model SL Series 2006
  • Eb Alto (ca 2005) Eb Alto (ca 2005)
  • Eb Alto 015177 Eb Alto 015177
  • Eb Alto 015779 - Goldbrass Classic Eb Alto 015779 - Goldbrass Classic
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