a collector told me once that Koch was the son in law of Franz v. Dreyse so his opinion was not disinterested.
the Baden custom's needle fire rifle was probably the very first using this bolt design and iirc the order for this rifle was made before the war of 70/71 so this design was maybe older.

pic of a rifle in 11,15x60R

hunting rifle in 10,5x47R

5,6x35R Vierling