Hard to tell by the image but it looks like the wear goes all the way to the edge of the coin. My non-expert opinion would be PMD; but, like PEA said I would wait for someone like Enamel or Huntsman to chime in.
-TwoYewts
The wear seems mostly in one direction, almost like it was sanded? I feel that if it was grease in the die it would be a smoother surface, and with the high points of the die still making a significant strike. The letters which are lower than other features are struck fine. I would say PMD but I am no expert.
Send a pic to Mike Diamond. I personally believe that's a struck through die cap.
After further review, the tie goes to Huntsman! Mr. Diamond felt that the coin was mechanically altered. Oh well, I thought it had a good chance and will take it to my LCS and see what they say as well.
Thanks everyone for your input