German Wehrmacht Officers Trench knife. Dagger

Description

I have for auction  a German (Wehrmacht)  officers  trench knife-dagger from WW-1 from what i understand this is not a dress knife rather it was used  as a fighting knife ..  The overall length is 8 3/4 inches and the blade is 4 1/2 inches it is in very good condition( may be polished I dont Know)   there is no rust or damage to the blade it does have some light scratches and some staining. One side of blade is -Zak Germany the other side has no marks..
The grips appear to be jigged bone and are in great condition.. There are 3 pins holding them in place.
I found the last 3 photos on Ratisbons military auction site they depict the exact same knife .. I got  this knife from a man who also sold me some German medals all of which turned out to be real.
I dont have a clue what its worth I will start the bid at .00  with .00 shipping to the lower 48 only..