UBB.threads Forums Edged Weapons Army, Navy, and Luftwaffe Forum Help with identifying a marking

I own a chained DLV dagger, it has the markings SMF, Solingen which I already know that's where and who it's made by, but it also has the marking 178 stamped into the scabbard and on the curve of the quillon. I was wondering if anyone would be able to tell me what this means.
P.S. It does not have an RZM number on it.