If it is authentic and a real nfl licensed football, they can be worth $500-$800.
It depends on the year. An Eli Manning autographed rookie card would be worth about $50. Anything after is pretty much worthless.
Well the card itself is worth $25 but since it is autographed it can be worth anywhere from $125 - $350. You just have to find the right buyer.
I just seen one go at auction for $20,000.00 i currently own 2!
Less then Peyton Manning.