A Curtis Granderson game used bat in general is worth about $200.00 - $275.00 if accompanied by the proper paperwork (authentication) or provenance. If the bat is not authenticated as "game used" it could sell at half the market value or less. The signature should be authenticated as well. The signature might have little impact on the value more or less. Most Game used collectors would prefer the bat unsigned, as close to the condition as it was used by the player. The bulk of the value will rely on the bat being game used, and the signature is secondary. The signature can add some value depending on the collector buying it and if he inscribed it as GU (game used).
The degree of game use could also effect the value of the bat. Game used bats do not receive grades like "Mint" or "Near Mint" based on sheer condition. Game-used bats need to show some sign of wear in order for the expert to render an opinion. It is also part of the appeal of collecting game-used bats. Most collectors of game used bats prefer bats that Show "great use" The degree of the crack or if the crack was properly mended could effect the value as well.
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