A LOT! EVERYBODY WANTS HIS AUTOGRAPH! NOBODY HAS IT!
Joe Montana silver coin 1980
Without a COA it wont be more than $125. Especially because he played football not baseball
Now it is worth 4,200 for only Joe Montana so, good for you
The Joe Montana RC is currently worth about $100 in top condition. If your card is not in top condition it is worth significantly less than that.
about a dollar
Unless its on something valuable, probably not a whole lot.