Signatures that are not properly authenticated could sell at half the market value or less. Compare your signatures to others that have been authenticated by a trusted company like PSA/DNA or JSA. Search through the auction archives of a number of auction houses. After comparing your signature to a number of authentic signatures and you feel that your signature is likely authentic then have it done professionally.
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It is important to know when an item is bought that it is authentic. A Certificate of Authenticity is usually given at the time of the purchase.