Someone help, is this an error? 0

[Frank dabank]

I have this newer quarter that is missing the reverse side. There are some stamping in it but not the state or the year. I know it was minted in Denver but that's it.  I have more pictures of these aren't good enough. 

Edited December 12, 2019 by Frank dabank

[DWLange]

That was an alteration performed outside the mint, perhaps for some sort of novelty.