Hi Mister Aurel, I think better pictures of the scabbard, front and back of the pommel and maker mark are needed to make a precise judgement. The grip is a replaced one as Eickhorn only done the white celluloid over wood type. Check to see if the scabbard bands are separately applied or pressed out and check with a magnet to see if its magnetic, hard to tell with these pictures.
First Eick I have seen with an orange grip.. could they have bought a few from WKC in a time of shortage? Could be as they traded parts a lot. Hard to say for sure, what do you know about the history of the piece? Been in other collections? Kevin.
I agree with Tomaz that the grip most likely is a replacement. Better pictures are needed to judge the rest of the dagger.