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An Zack Greinke single signed Baseball is worth approximately $97 if it is on a Rawlings Official Major League Baseball and is signed on the "sweet spot".

These values assume that they are all authenticator by a reputable company. An autograph that isn't properly authenticated can be worth as little as half of the value of an authenticated signature.

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Q: How much is a Zack Greinke autograph worth?
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