Source: kesslerandsons.com

This is how Dave described the horn's specs on the company's website:

Julius Keilwerth MKX Tenor Sax
JK3000-9-0 | Antique Finish
 
Keilwerth MKX Tenor Sax 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
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