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 flare engravng
right side lower portion 1
bell
s-l1600(4)
bow left side
bow right side guard
s-l1600(2)
left side neck attached
s-l1600
s-l1600(10)
right side lower portion 2
s-l1600(6)
right side neck attached
bow left side guard
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