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Certificate Of AuthenticityFor a signed Baseball COA would mean Certificate Of Authenticity. Like a Letter of authenticity it verifying the originality or genuineness of a sports collectibles item. If the letters COA is written on a hologram or sticker it should have a matching letter accompanying it at verify it is the item authenticated.
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12y ago
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15y ago

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 aquire the signatures yourself, or are not sure of its origin, do your homework. Before spending money on having the autograph authenticatedfind 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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12y ago

PAAS - (Professional Autograph Authentication Services)

COA - (Certificate of Authenticity)

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10y ago

It stands for Certificate of Authenticity.

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Q: What does COA stand for in sports memorabilia?
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