Are unopened baseball cards more valuable than those that have been open, if so how do you determine what cards you have?
How valuable are baseball cards?
How valuable are Michael Jordan cards?
Is a Jason Kidd rookie card valuable?
What are error cards?
What are the most valuable NBA cards?
What is the value of a Brett Favre rookie card?
collecting value
Question by ToughTime (35)
Answer by brett29 (467)
It depends on what year they are and what condition they are in. If it is his rookie card and in good condition it could be worth 100$.
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