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. A signed photo sells between $400.-$700.