50$-300$ probobaly
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A Keith Hernandez signed magazine would have a value of about $30.-$75. in Excellent - Near Mint condition, if the signature is properly authenticated. Signatures that are not properly authenticated could sell at half the market value or less.
The display of the signature on the magazine cover will dictate the bulk of the value. Condition is very important and minor flaws will bring the value down significantly. A magazine in exceptional mint condition could sell for more. Common flaws will include staining, foxing (yellowing), fading color, creases, rips, loose pages, cracked binding, mailing labels, and writing on the cover. The overall condition of the cover and how it displays the signature is most important.
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