From what I can see I like it.It seems to have too many things right with it to be wrong.I would think it would be difficult too make a parts dagger look like that. It does almost look rather new handle,scabbard no tears or rips ect. Shine a light inside the scabbard too see if it looks new inside.Perhaps the blade was switched at some time which may explain alot.Fakes could be improving with HJ leader daggers also.It seems too me that it is just in really good shape which does not make it fake,it shows nice patina on alot of the components including the hanger.If original its a nice rig

"Those who do not remember the past are condemned to relive it" Santayana