Instructions
Contact an autograph expert. There are many reputable autograph authenticators in the marketplace across a range of fields. Some specialize in a certain area such as sports or historical signatures. Professional Sports Authenticator, Global Authentics LLC. and James Spence Authentication are all leaders in sports autograph authentication.
Submit the autograph and all associated documentation. Each company has a different policy; you'll be asked to submit the autograph to the company by delivering it in person or through the mail. Include supporting documentation. For example, if you have a signed costume by a movie star, submit a photo showing the actor wearing the costume. Autograph authenticators looks at the whole mosaic presented. A photo of the actor wearing the costume before signing it validates the whole tableau.
Speak with the authenticator about whether or not the autograph is authentic. Knowing the reason for the autograph's validation helps you understand the thought process of the authenticator and provides you with talking points should you ever choose to re-sell the item. The authenticator compares items such as the formation of letters, pen pressure and depth of ink on the paper and compares the signature to other authenticated autographs by the same person.
Request and receive documentation from the authenticator validating the autograph is legitimate. The certificate should include the name of the company and the individual who authenticated the signature, the date and if possible remarks by the authenticator about why the autograph is believed to be authentic.