A Sammy Sosa signed bat is worth about $250.-$400. The most preferred bat for a signature is a bat closest to the size, and model the player used. The better the quality of the bat the higher collectors value it will have. Add for inscriptions. Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. In a recent auction a Sammy Sosa signed Baseball bat sold for $262.90 A Sammy Sosa signed game model baseball bat inscribed "Slamming Sammy" sold for $489.
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