Serial numbers definitely indicate that they weren't built by Keilwerth.

Keilwerth made at least a couple different versions of the H-Couf Royalist models for Armstrong, but they didn't make all of them. I've seen at least two different models of Grassi horns and I'm sure there are others.

There is a model made immediately after the "Model 28" Royalist that has "Armstrong" engraved on the bell and no mention of H-Couf. These horns have serial numbers that start with 29.

  • bell bell
  • bell flare engravng bell flare   engravng
  • bow left side bow left side
  • bow left side guard bow left side   guard
  • bow right side guard bow right side   guard
  • left side neck attached left side neck attached
  • rear view lower portion rear view lower portion
  • right side lower portion 1 right side lower portion 1
  • right side lower portion 2 right side lower portion 2
  • right side neck attached right side neck attached
  • s-l1600 s-l1600
  • s-l1600 s-l1600
  • s-l1600(1) s-l1600(1)
  • s-l1600(1) s-l1600(1)