A letter from a player, team, or League official would be acceptable. A letter from a fan at the game would not hold much weight if any. Without provenance the value will rely on the buyers belief in the story. Otherwise you would just have a used Major League Baseball and would have a lower value than a clean white baseball
A Homer Bailey single signed baseball is worth about $30.-$40. 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.
If the baseball is inscribed by Homer Bailey in reference to the no hitter it could add value as would a signed "Stat ball" describing the no hitter.
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