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What is the BEST company to get a COA for sports autographs from?

I am looking at buying a autographed football for a friend for the holidays and I do not know the difference in one COA from another – The latest one I looked at has a COA from Global Authentication Inc (GAI) and comes with a matching tamper proof stick and serial number. Is this a good company and if not what company should I be looking for when it comes to autographs? Thanks

the company you have mentioned is as good as you get it is trust worthy and well worth buying from

JOHN KENNEDY-JFK AUTOGRAPH + JOHN GLENN AUTOGRAPH-RARE W.H.1962 PHOTO-GAI CERT. £817.11

Tom Brady Autographed Jersey COA GAI AUTHENTIC NWT NO RESERVE £1.73

Tom Brady Autographed Jersey COA GAI AUTHENTIC NWT £22.47

Shirley Jones Music Man Signed Autograph Photo GAI £28.34

MINNIE DRIVER AUTOGRAPH SIGNED BOOKLET + CD FRAMED GAI £55.43

Sonny Rollins Jazz Signed Autograph Guitar Pickguar GAI £47.24

Kirk Douglas Adrian Messenge Signed Autograph Photo GAI £40.94

Signed HEATH LEDGER Autograph “The Patriot” UACC COA, blu DVD, Global GAI Batman £500.85

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