Source: kesslerandsons.com

Here is how Dave described its specs on the company's website:

Julius Keilwerth MKX Alto Sax
JK2000-9-0 | Antique Finish
 
Keilwerth MKX Specifications
Country of Manufacture:  Made in Germany
Finish:  Antique Brass w/Black Pearls (also available in Gold Lacquer)
Tone Holes:  Straight Holes
Range:  Low Bb – High F#
Body Material:  German Brass
Body Construction:  Single Post to Body
  • jk2000-9-back jk2000-9-back
  • jk2000-9-bell-brace jk2000-9-bell-brace
  • jk2000-9-bell-logo jk2000-9-bell-logo
  • jk2000-9-engraving jk2000-9-engraving
  • jk2000-9-inbell jk2000-9-inbell
  • jk2000-9-incase jk2000-9-incase
  • jk2000-9-lh jk2000-9-lh
  • jk2000-9-neck jk2000-9-neck
  • jk2000-9-octave jk2000-9-octave
  • jk2000-9-rh jk2000-9-rh
  • jk2000-9-rhthumb jk2000-9-rhthumb
  • jk2000-9-sax jk2000-9-sax
  • jk2000-case jk2000-case
  • jk2000-case-latch jk2000-case-latch