To add my 2 cents worth here, and not taking any position on this particular SS dagger since I profess to know nothing about SS daggers nor SS makers, I have found a very simple question will answer the issue of originality or authenticity when you asks this of any dealer or anyone who resells blades:

'I am thinking of selling this dagger or item, will you make me an offer? If not, why not?'

I have found this question short circuits some of the automatic defenses that arise when you ask one dealer for their opinion on another's items.

John

Always looking for Eickhorns and etched bayonets.