| worth of 1988 Topps Oakland A's Leaders card signed by Mark McGwire & Jose Canseco
I have a 1988 Topps (759) card that was signed by Mark McGwire & Jose Canseco in Oakland almost 20 years ago. My older brother got them to sign it while they were warming up before a game. This card is in mint condition and there is a slight/faint thumb print mark on Mark McGwire's signature. The signature is not smudged. My brother and I think it is Jose's print because Mark signed it first. What would the approximate worth of this card be?
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