2 Euros Wwu with engraved letter K

Hi everyone…  I have found a commemorative 2 euros coin of the wwu from Germany. The coin has the letter F engraved that is normal…  but under the little man it has also a letter K engraved. I have been looking around for another like mine and I didn't find anything. Could someone help me to evaluate the coin?? 

Post mint damage.  Somebody added the letter K for some reason we'll never know.

Welcome to Numista!  For posts like this you need to add a picture of what you're talking about so others will also know what you're talking about.  You also should add the link to the particular coin you're asking about rather than making everyone else do it.

N#5054

Here's a post about someone else's K.  https://en.numista.com/forum/topic121105.html  Camerinvs gives a very good answer.