I think the best way you can figure out which horn you have is going to be first by general serial number range, and then (and almost as importantly) what is on the horn itself. Ok, so now that you’ve read that, I have seen some horns that don’t totally add up with the serial chart Pete has up, although it is a very good general guide. To get up to speed on Keilwerth New King/Tone King and their stencils, go to and give it a good read.
There is a picture of the New King and the Modell 3 I speak about in this article in the gallery.
I have recently become a big fan of early Keilwerths, around the serial 10xxx to 21xxx.
