The authenticity of Musk's signature has been verified and is accompanied by a certificate of authenticity from JSA. Bidding for the photo starts at $25, with estimates ranging from $100 to $200.

While it's unknown if he's ever been compensated for his autograph, there are more than 2,000 Jameis Winston-signed items on the James Spence Authentication website. Melina Vastola/USA TODAY Sports ...