Edge knives were a German import in, I think, the 80s....maybe into the 90s.
While they were a good knife, values are low.
I am guessing, but I suspect yours wouldn't sell for any more than $40-$50. They are not a collectible. Yet, at least.
If you want to win an argument, it is best to stick to the truth.....or,at least, provable untruths.