I seem to remember previously seeing a couple of Herder examples like this previously. My guess is some sort of sample to be used by a salesman.
When Kim Alstott and I used his example in my book: "NPEA DAGGERS and ASSOCIATED KNIVES", we felt that it was a salesman sample piece.
Thanks for the answers, here is a closeup of the medalion on the grip
Looks like a period, HJ style knife, but without the HJ motto right?
Best regards,
Herman