The mm3 on the knob is an inch mark indicating the size of the bat. (MM3 - Mickey Mantle 33" bat.) The model of the bat could have an effect on the value but the signature condition, display, and the type of authenticity, holds the bulk of the value.
A Mickey Mantle signed baseball bat is worth between $1,500.-$3,000. Price will vary based on condition, and type of authenticity that accompanies the signature. Rare examples of pristine signatures or inscriptions like "The Mick" "HOF 1974" or 536 HR's" could raise the price.
After condition the type of authenticity that accompanies the signature will dictate the price. Mickey Mantle was under contract with the Upper-Deck company before he passed away. Baseballs bats that have the Upper deck hologram could sell in the $3,000.-$5,000. price range. signatures that have not been authenticated could sell at half the market value or less
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