How can I tell if a signature is authentic?
I just purchased a signed photo of Cristiano Ronaldo from Planet Sports Memorabilia on eBay. It came with a certificate authenticity, but the certificate does not look very professional. Can anyone give me some idea as to whether it really is? (besides taking an expert)
You could try to find an example of the signing of Ronaldo on the line and the comparison, but ultimately the only way to be sure is to consult an expert,