How do you know it the 1964 autographed 1964 cardinal baseball is authentic?

Answer 1

Authenticating SignaturesYou would have to first determine if the signatures are hand signed or stamped on as a souvenir Baseball would have. A stamped signature would have no variation, the ink will be too consistent throughout.. Once you have determined if the signatures are hand signed compare the signatures to other signatures on line that have been authenticated to see if they are similar.If you feel that the signature are likely hand signed authentic signatures you would then need to have them professionally authenticated by a company like PSA/DNA or JSA. Before spending money be sure that they are likely hand signed authentic signatures. Do your homework.