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 that have the Upper deck hologram could sell in the $1,000.-$1,500. price range. signatures that have not been authenticated could sell at half the market value or less.
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You did not state what team the baseball is from. In general a stamped Signature Souvenir baseball from 1956 could be worth 30.00 - $100.00 in excellent - near mint condition depending on the team. A baseball that features players like Mantle, Mays, Clemente or Aaron will sell at the higher price range.
Value 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.
If the signatures are not properly authenticated the baseball could sell at half the market value or less.