I have a santos shirt(team pele played for) he signed his autograph on it.how much is it worth?

Look on Ebay for similar sales... the thing to know in Sports Memorabilia and or any Memorabilia is that something is only worth what someone is willing to pay. An appraiser could tell you that it is worth a g ball and if there is no one willing to pay that is it truly worth it? All you can do is price the market and if it is worth more to you to keep it, stash it away for a rainy day. To me... it is worth $20, but to my neighbor it may be worth $500?? Picking up what I am puttin down?