Value with regard to a signed item like this begins and ends with authenticity, as there are few other issues if the card is in presentable condition. If genuine, this card would be worth between $200-300 depending on the clarity, boldness and placement of both signatures. With Autographs, a picture is truly worth the proverbial thousand words, and can save alotta time in the authentication, appraisal, and selling process.
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A Mickey Mantle and Roger Maris signed ball is worth alot! I predict you could sell it in the low thousands (2000). This is just a prediction based on prior knowledge. A Mickey Mantle, Roger Maris Dual signed Baseball is worth about $3,000.-$5,000. Price will vary based on condition, type of authenticity that accompanies the signatures, and which signature is on the sweet spot. One player or the other on the sweet spot might not be worth more than the other, but if a collector bidding on the ball is a favorite of one or the other that collector will pay more for that player on the sweet spot.
In a recent auction held in October 2007 a Mickey Mantle, Roger Maris Dual signed baseball sold for $4,780.00 (Mantle on sweet spot).
Signatures that have not been authenticated could sell at half the market value or less. For more information on autographed baseball visit the link I left below.
A Mickey Mantle Roger Maris signed 8 x 10 photo sells for about $1,000.-$2,000. Price will vary based on condition, and the type of authenticity that accompanies the signature. A color photo as opposed to a black & White photo is not important as composition, and appeal. Part of the value will be determined by how well the photo displays the signature. The type of ink used, and how it stands out in contrast to the photograph will also effect the price. Sharpie would be most preferred for a photo. Larger 16 x 20 photos will sell for more.
In a recent auction a Mickey Mantle roger Maris duel signed photo sold for $2,101. Signatures that have not been properly authenticated could sell at half the market value or less.