The lowest priced signed item would be for a "cut Signature." A cut signature is a signature on a piece of paper, or "cut" from a larger piece. Index cards are the next step up, and both sell at a fraction (about 10%-20%) the price of an autographed baseball. Autograph photos typically sell at about 40-60 percent the price of a baseball with bats, uniform Jersey's and equipment selling at a higher price due to the higher cost of the item, rarity and display.
In general if an autographed baseball is worth $100. the same autograph on a 8x10 photo $50. a cut signature $20. on a bat $150. The percentage of the price could also vary based on the popularity of the player, and how sought after the signature is.
A Derek Jeter Single signed baseball is worth about $150.-$250, however if could be more or less depending on the kind of ball and how many other signatures are on it. A Derek Jeter signed 8 x 10 photo is worth about $130.-$175. Photo composition, and appeal will effect the price as well. 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 and more desired pictures could sell for more.
In a recent auctions a Derek Jeter single signed baseball sold for $203. a Derek Jeter 8 x10 photo sold for $155. a Derek Jeter signed game used batting glove $418, and a Derek Jeter pro model baseball bat sold for $391.
Derek Jeter's rookie signature is worth more, and his signature has changed over the years, so it is fairly easy to know the era of the signature that you have. That being said, one can generally not pinpoint an exact year, as his 1992-94 signature may look similar. Personal inscription like "Good Luck Mary" will sell for less, unless the inscription is to a famous person such as an actor, politician, or teammate.
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