In Mint condition with a #4 Favre Hologram and accompanied by a certificate of authenticity with matching #'s, between $600-900. If it is just a ball you had signed in person, any pices of evidence can help build value in the ball (Photo of him signing it, photo with Favre, you, and ball, etc) then it is probably $150-400, depending on the type and amount of supporting evidence.
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