I know the answer I am going to get here, but am asking anyway. In doing my weekly roll searching I ran up on a 1981D that has surfaces just like a proof except no cameo. I assumed at first someone did a polish job on it but here is where I started to question myself. The fields are mirror finish and dead flat, no polish marks and no dishing or rounding of edges. On top of that the mirror finish is perfect inbetween really small features such as the rays above the eagle and in between letters. That is nearly impossible to accomplish with a buffer. Were there ever and clad Denver or Philli minted coins accidentally struck on proof planchets?