[Bestdj777]

Welcome to the forum. I am sure some experts are going to weigh in on it but, based on what I've seen, it is unlikely to have much in the way of value given the condition, the fact that there are multiple signatures on the ball, and the fact that there is very little connecting any of the signers to the type of ball it is signed on. I think I spent about $250 on a pretty clean signed baseball of Mantle and a few other hall of famers. Although I likely got a decent deal on it, I couldn't imagine yours would come even close to that price if it is indeed really rough. It's likely one of those things where you'd just want to hold onto it as the memories are worth more than the item itself.

I recommend posting pictures for a better idea of value.

As for certification, I would advise against. If you were there, you know it is real. And, the cost of getting a certification on it would not be cheap. If you are looking to sell, Net54 is a great place and you can move it without the certification if real. I know I've gotten two Mantle autographed balls here and would be a buyer of yours if the price was in line with the value and the autos checked out by the board.