I just bought a poster on eBay from the TV show “Vikings” signed by two of its actors. I researched the eBay seller and actually saw she had a history of selling a mix of both real and fake autographs. Normally, this would be a red flag and a pass for me - however, she said this poster is a pre-signed handout from the 2016 San Diego Comic Con. I matched it up with two other examples of the same poster previously sold from other sellers and everything matches - the poster itself, the ink color, and the placement and look of the autographs. See the below photos - the first photo is the one I just bought and the other two are similar examples sold years ago that I found on Worthpoint. The two other sellers were able to get additional autographs in addition to the two it came pre-signed with. Would you say this is sufficient proof these autographs are authentic? Or would getting a PSA certification be worth it just for peace of mind? Thanks for your help!