2001 Game used World Series baseballs sold, and authenticated by Steiner Sports sell in the $100.+ price range. If you caught the Baseball at the game it will be hard to prove that the baseball was used during a World Series game. A letter of provenance from a team player or league official would be acceptable to prove it is a World Series game baseball. Then it could have higher value. A letter of provenance from a fan at the game will not hold much weight if any.
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Price is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Prices may also vary based on the amount of signatures, and key signatures acquired. The more complete the baseball with key signatures the more valuable.
The World Series baseball might add some value but little if any. The bulk of the value will be dictated by the condition and display of the signatures.
Signatures that have not been properly authenticated could sell at half the market value or less. For more prices on team signed baseballs, list of Key signatures, and links to full team rosters see Related Links below.
In 2004 World Series game used ball ranges from 200 to 400 dollars. The cost may vary considering on autographed signature.