A Mickey Mantle single signed Baseball is worth about $400.-$600. 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 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. Without seeing the degree of the fading it would be hard to put a value on it. If it is not too bad it could still bring a price higher than $200.-$300. The key to the value of the signature would be the letter of authenticity that accompanies the signature. Even if the signature is strong it might only sell for $200.-$300. if it has not been properly authenticated. Depending on the degree of fading $75.- $150. If the signature is not authenticated by a respectable company. Two of the top, and most trusted authenticators are PSA/DNA, and James Spence Authentic (JSA). Collectors will pay more for signatures authenticated by either one. Most important never retrace a signature. I have been asked this question many times. A baseball with a light or faded signature will be worth more than one that has been traced.
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A Mickey Mantle signed baseball card in general is worth about $150. -$300.
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. Signatures that have not been properly authenticated could sell at half the market value or less Once a collectible Item like a baseball card is signed it looses it's value as such, and becomes an item to display the signature. The bulk of the value now relies on the value of the signature. To the baseball card collector the signature would be considered a flaw in the condition of the card. The signed baseball card might be desired by the autograph collector.