Oxymoron? Received a request for a Certificate of Authenticity for a Contemporary Counterfeit coin!

Just wondering how I should write this COA? I have ideas, but thought I would hear some of the creative answers from the diverse audience of members here first.
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Comments
Macro-details on the piece and the transaction and possibly something about the buyer's level of knowledge might help..
More often than not, COAs are PITAs.
This is a counterfeit of [describe]. It appears to be contemporary and was manufactured prior to [date].
ANA 50 year/Life Member (now "Emeritus")
Issue a "Certificate Of Non-Authenticity." A CONA.
BHNC #203
Contemporary counterfeit obsolete currency is cataloged and certified by PCGS and PMG along with genuine notes. Both genuine and counterfeit notes are collectible and exist in limited quantities. The Haxby and Bowers catalogs both use a "C" instaed of "G" prefix for the catalog numbers of the counterfeits.
Agree.
Or you could describe it as a "Genuine Counterfeit".
An authorized PCGS dealer, and a contributor to the Red Book.
@CaptHenway ...CONA is not a good word in Portuguese...
I lived and worked there for a few years...Cheers, RickO
Issue a "Certificate of Appraisal". That way you are attesting to what it is. Using one everyone knows, you can say that the item is an Omega Man counterfeit, or a Beirut Counterfeit with a value of XYZ. For certain purposes this will probably work for the person.
"Contemporary Counterfeit" is the most accurate term to use.