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Dan McCarthyIf you could provide a larger picture or scan of the card it would certainly help in determining the authenticity of the signature. Provided the signature is real I'd guess $80 to $120, maybe a speck more on a good day. I have two Williams autographs, one authenticated by JSA and one by PSA, and I paid $90 for one and about $125 for the other (granted, they are not on exhibits but I don't think there is much value in the card anyways unless it's in wonderful condition).
Dan