Well Brian, you are absolutely right!
Even if can "smell' the fake German dagger from the distance, it's still a minefield.
I'm also tired of arguing with some people who come out-of-nowhere claiming to be the "seasoned collectors" and offering me single blade - obviously fake - telling the stories how "his father or grandfather removed this particular dagger from dead German soldier in Omaha Beach, Normandy."
When I ask what "soldier" would carry the Feldherrnhalle dress dagger into the combat and tell that dagger looks to me more like the Spanish poor copy, I'm always ended called "an ignorant", "idiot" ... or worse.
So I decided to keep some of my best pieces and move to Japanese swords area which looks to me for now "terra incognita" - pretty scary, huge field to explore (that's what I love in collecting!).