Thurman Munson did not sign often but it would be impossible to put a number on it. A Thurman Munson single signed Baseball is worth between $4,000. $8,000. I have been seeing prices lately breaking the $10,000. price. 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.
In an auction that closed in June 2007 a Thurman Munson single signed baseball sold for $2,031.In an Auction that closed January 20, 2008 a Thurman Munson Single-Autographed (MacPhail) Ball, PSA/DNA Grade 8.5, Autograph Grade 9 sold for $17,291. Team signed baseballs with Munsons signature have also been on the rise
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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. If the signature is an early variation of Thurman Munson's signature it will sell for more but it must be properly authenticated and should be graded.