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