Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions.
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An Willie Hernandez single signed baseball is worth approximately $65 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.
The last single-signed Willie Jones ball I saw sold was on the Hunt Auction online and it sold for around $550. About a year ago, Willie's auto went for $350 on the same site.