An autograph that is not authenticated by a creditable company could sell at half the market value or less. Two of the top, and most trusted authenticators are PSA/DNA, and James Spence Authentic (JSA). Collectors will pay more for signatures authenticated by either one. It may sound odd but in some cases PSA/DNA, and JSA authenticated signatures may sell higher than a Letter of authenticity from an unknown or less trusted authenticator that witnessed the signing even though PSA/DNA, and JSA did not. It's just a matter of collectors trust, and collectors will pay more for it.
Check the respective websites Show Schedule to see if they will be in the area that you live. They also do business through the mail. If you did not acquire the signatures yourself, or are not sure of its origin, do your homework. Before spending money on having the autograph authenticated find signatures on line that have been properly authenticated, and compare them to yours. If you feel comfortable that they are authentic then proceed. Try these helpful Links below for comparing signatures.
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The most reputable third-party autograph authentication companies are PSA and JSA.
A determination of who is "the best" depends on what you're looking to do. If you're buying, then you are relatively safe relying on either company. If you are looking to have items authenticated, it depends what items they are and why you want them authenticated.
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MLB has a Baseball Memorabilia authentication program where they are now authenticating memorabilia. Its the best way. others PSA/ DNA, Steiner Sports, ASI.