Knives with maker marks and differing RZM marks are sometimes encountered. Possibly because they ran out of blades, and purchased some from another company to complete an order and stamping their own RZM number on them to comply with the regulations.
I have a list of those seen so far, about 5 or 6 - I'll see if I can find it.
thats fine in this combination, Klaas most have run out of blades and purchased some from Horster ( i presume rzm being stamped last ) There was a thread, i cant seem to find it so must have been on the old website.