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Message:: [QUOTE="johnmilton, post: 7992613, member: 101855"]I was thinking that it might have been worked on when I saw the grainy red surfaces. That indicates that the piece was made red again by dipping it in a mild acid. This type of coin is very frustrating because it is almost never stable. It will probably turn, no matter what you do. I would avoid using any type of coin envelope for red copper. You never know what might be in the paper, even if it says it's sulfur free. The best devices are slabs or Capital Plastics holders. Next are safety flips which have no PVC. In all cases you have store the coin in an atmosphere that has consistent temperatures. Some bank safe deposit boxes can fail you on that score. [ATTACH=full]1386649[/ATTACH] I have owned this piece for over 20 years, and it's NGC certified MS-65, Red. Knock on wood, but it has not changed color over that period of time. If you would like to try again, I would suggest looking for a certified coin in an old slab(at least 5 or 6 years). Don't buy anything that has been certified recently. The services are not great at catching something that has been dipped recently. if the coin has remained stable for a number of years in the holder, chances are, with proper storage, it will hold up for you.[/QUOTE]