http://cgi.ebay.co.uk/QUEEN-FREDDIE-MERCURY-PHOTO-SIGNED-WITH-COA_W0QQitemZ140035054801QQihZ004QQcategoryZ58697QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Please check out this item and note that the pic isn't Freddie but the UK Stars In Their Eyes winner Gary Mullen.
I have informed the seller.
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That just goes to show you that, most times, a COA ammounts to two things: Jack and Shit.