Before I continue, below are links showing hundreds of examples of forged Mickey Mantle baseballs, photos, etc. found on Ebay (the most dangerous place to buy autographs if you're a casual collector or impulse buyer).

https://live.autographmagazine.com/forum/topics/ebay-mantle-dimaggi...

https://live.autographmagazine.com/forum/topics/examples-of-mickey-...

https://live.autographmagazine.com/forum/topics/most-common-mantle-...

Here's another forged Mickey Mantle baseball that sold on Ebay; it was sold by Ebay seller ldockter60 for $399.00 (Best Offer Accepted..the original Buy It Now price was $495.00.

The worthless COA is from Mail Order Concepts.  I have yet to observe one authentic autograph with the aforementioned COA.

https://www.ebay.com/itm/256236128579?hash=item3ba8dd0943:g:g~QAAOS...