Derek Jeter signed 11 x 14 photoA Derek Jeter signed 11 x 14 photo is worth about $150.-$250. Price will vary based on condition, and the type of authenticity that accompanies the signature. 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. Sharpie would be most preferred for a photo. Larger, and more desired photos will sell for more.
Signatures that have not been properly authenticated could sell at half the market value or less.