Ok - I am at a complete loss. Obverse of coin has an oval shaped area that is concave where some of the planchet seems to have been missing. It appears that a portion of the image from the reverse was struck on this. The red arrow I have is pointing to what maybe appears to be the top half of an "O"?

Ok - now if that isn't weird enough - the reverse of the coin has a chunk missing that would make me think
PMD, however, the memorial building is present like it was struck. Weird.

Also - looked at this further - the thickness of the coin changes as you rotate the coin through your fingers when looked at from the side. So either it was bent/damaged, went through some trauma during minting, or the planchet was defective in the first place.
Any thoughts? Thanks
Merry Christmas to all.