I just purchased a piece of artwork by Picasso. How can I authenicate it? :confused: There is no signature, no number... only a date. I have found the same piece on the web as a print, but this is not a print... it is done on something that looks like pressboard. The pastels are totally intact, and it appears to be quite old. I have researched the web, but cannot find out anything about the original of this piece, only prints of it. What do I do next? (It seems like all appraisers are either in New York, California, Sweden, France or Germany).