Source: weinermusic on eBay.com
In December 2021, Weiner Music listed 2 brand new SX90 bass saxophones for sale through their eBay store. They were described like this:
US $24,360.00
Keilwerth SX90 Bass Saxophone JK530080 NEW!
KEILWERTH BASS SAX JK5300-8-0
Professional model. The Keilwerth SX 90 bass saxophone produces a rich, deep tone. It adapts perfectly to an ensemble and gives a superb solo sound.
Key: Bb
Range: Low Bb to High F#.**
Body: Removable bow for easier repairs.
Pads: High quality leather with metal resonators.
Case: Bullet case.**
** These horns are only keyed up to high Eb. You can see that in the photos. And while some are reputed to go to high F, I have yet to see a modern JK bass that does so. The only one I have seen to high F, is the
Toneking in our gallery.
** I want to see these bullet cases, since the one shown in the photos is the normal JK bass case which is the size of a coffin, and quite impractical. Me thinks this was a misprint. (Like the high F#.)