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I have some Retro Football Shirts that I found recently among my father’s things as I was cleaning out the attic. I know that some people like these, and I am wondering whether or not it might be possible to sell these to make a little bit of extra cash. Can anyone tell me where I might be able to get the most money for these? They are in really good condition. I am not sure how common they are, just that they are not the shirts that are currently being worn by the teams. Where can I find out how much these are worth?