[Bestdj777]

I echo what the others said. I think it is an awesome piece given that Mantle is pictured on the front, but a collection of autos, particularly without a popular theme, typically is worth less than one or two of the individual autographs.

My advice is to try it on the BST. And, if you ultimately decide to consign it to an auction, let them handle the authentication process. They typically do it for you there, so no need to spend the money on your end now (not sure if they charge you for it, but I would imagine it is a reduced rate over what you would pay ordinarily even if they did).