Maralunga chair knockoffs?  

I just came across a pair of chairs that look exactly like vico magistretti Maralunga chairs from the 70's except that the back does not raise.
There is even a Cassina made in Italy label on the mail frame of the chair under the seat cushion.
Does anyone know of knockoffs of this chair and if anyone made chairs and stole the Cassna label?
They are excellently made, very comfortable and nearly perfect in every detail that I wonder if it could be a knockoff or the back is simply misfunctioing?
Any ideas?