Certificate of authenticity COA*

Certificates of authenticity are issued for coins, but what exactly does it mean?
Certificates of Authenticity This type of certificate of authenticity is used for works of art, coins, stamps, fashion, jewelry and the like. They are often attached to the product in paper form.
One can find a lot of information about the certified product on them.
This includes, for example, the place of manufacture, manufacturer or artist.
Often, contact details of the manufacturer are also noted. An example of such a certificate is the one sold after the fall of the Berlin Wall by so-called Mauerspechten with pieces of the wall.