A Tony Gwynn signed 8 x 10 photo is worth about $20.- $30. Price will vary based on condition, and the type of authenticity that accompanies the signature.
Photo composition, appeal, and how well the photo displays the signature will effect the value. 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 and more desired pictures could sell for more.
In two recent auctions (Dec. 2008) a Tony Gwynn signed 8 x 10 photo sold for $9.95, and a Tony Gwynn Signed 16 x 20 photo sold for $18.49 Signatures that have not been authenticated could sell at half the market value or less.
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