if third party authenticators base their opinions on who it came from, then they are fools. Don.t know who werhmann is, but the world is riddled with thousands of major people who have lied. Ever heard of Nixon?
And of course there has been many fraudulent authenticators. But the good ones use a combined scientific analysis plus a "feel" to say if real
The authenticators cant really do nirvana unless theres photos of them signing etc..
Ive racked my brains over them authenticating Cobain / Nirvana graphs.
I think they are tough but not impossible. There are things to look for. It's not a total loss when trying.
Sling- Michael Wehrmann may be the most honest in person collector in the history of the hobby. I do get what you are saying, but truthfully the guy is as honest as they come.