A Mickey Mantle single signed Baseball is worth about $500.-$800. Price will vary based on condition, and type of authenticity that accompanies the signature. Rare examples of a pristine signature or inscriptions like "The Mick" "HOF 1974" or 536 HR's" could raise the price to the $1,000. price range. Personal inscription like "Good luck Mike" could sell below $400. A rarely signed full name signature "Mickey Charles Mantle" will break the $2,000 price mark as it did in a May 5th 2007 live eBay auction selling for $2,390. The baseball being a 1952 "game day" baseball could have a lower value based on condition. A clean white baseball would be most preferred for the signature. If the baseball cannot be properly authenticated as a baseball used in a Yankee game in 1952 the baseball is just a used baseball. Any added value will rely on how much weight the buyer of the baseball puts on the story of the baseball being a "game day" baseball. Without a strong letter of provenance proving that the baseball was a 1952 game baseball, it cannot be sold as such. Provenance is the history of ownership of a particular item. It allows the buyer to secure additional insight as to the origin or chain of custody of the item. A letter form a team player or official would be sufficient, a letter from a fan at the game would not hold much weight if any.
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. In a recent auction (Aug 2008) a Mickey mantle single signed baseball sold for $537.75 (May 2008) - $657.25 A Mickey Mantle single signed baseball inscribed "HOF 1974" sold for $1,434.00
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In general A signed Mickey Mantle baseball card is worth about $150.-$300. Signed on a Topps #311 Rookie card it will sell for more than an inexpensive card" but well below the price of a Non graded unsigned card.
A 1958 Topps #150 Mickey Mantle baseball card Signed sold at auction for $338. The same card in the same condition unsigned sold for $332.55. If I find a Signed Mickey Mantle Rookie Card I will up date this post. I would say that the signed Rookie Card will sell at about 25-50 percent the price of a unsigned card in the same condition.