PSA has graded 129 of the white letter variation of this card, unsigned, Beckett has graded 3 more. Your autographed version is the first to be given a number grade, the other two PSA has seen are both graded Authentic. I'm not sure the autograph improves the resale value that much, as most set collectors would rather have it unsigned.
https://www.psacard.com/pop/baseball...68/topps/49709
Not even going to attempt to look for the Pop in SGC because I don't believe their pop report has any from their previous site integrated yet.
Edit: Oh, and in order to make only the card show up, you'll need to edit your scan on your computer (either by scanning a smaller area or by cropping the image in a photo program afterwards) before you upload it to the website.