Hi! I recently purchased what I am hoping is an authentic vintage Knoll Barcelona chair through a charity shop auction. If anyone has any advice/thoughts on authentication it would be terrific. (I have reached out to Knoll by email and am waiting for a response). I would also love any thoughts on replacement/restoration of the cushions as they could use some TLC, especially the piping.
The bottom seat cushion has a fabric tag on it that is marked "Knoll International" with an address showing on 320 Park Avenue. I believe that Knoll would have been at this address, with the name of "Knoll International" in 1969 (though obviously, the chair may have been sold after that date). The straps appear to be a different color from the cushions and also seem to be in better shape, so I expect they were replaced at some point in the not-too-distant past. They are affixed to the frame with screws. Additionally, the metal frame is non-magnetic, so I anticipate it is stainless steel. It is a one piece frame. Any assistance would be great and thanks in advance for your time/consideration! 
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