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Message:: [QUOTE="Chuckster 125, post: 389251, member: 14233"]That was the outcome- Mike Diamond determined it was post-mint- not consistent with valid die deterioration he has ever seen, but he could not figure out exactly HOW it was done. I had all sorts of explanations on it over at the Coin Community Forum, from Lemon Battery Test to high powered commercial blow-torching to different acid treatments etc, yet no one really knows  EXACTLY HOW it was done, especially since there is no weight descrepancy. They even contacted members of the metal club to see if they could figure it out- never got a response back. The coin is the exact weight for a normal 1980 LMC. No one has  been able to even come close to duplicating this coin by any of the above means mentioned.:headbang: Unfortunately, you may end up in the same boat, but you never know, maybe someone has  the  answer, especially on how to make those ripples on both coins. Try posting your pics on the Coneca error forum site to the attention of  Mike Diamond .   It wouldn't hurt for him to see ANOTHER ONE out there. Good  Luck!!!![/QUOTE]