Ha! Not quite. I've had these a long time. Came out of an old frame with different war time coins. Not in the best shape, but pretty to look at.
Wish I had a coin that was toned these colors. This is a piece of Bismuth that was lab made in Germany. All Bismuth is made in a lab.
I have seen a lot of 1970-S Proof cents that have developed that type of toning in the government package. I don't know if it has something to do with the stuff the mint used to wash the planchets that year, or if it's some that is not inert in the mint holder.
I am not much of a "toner collector." I have rarely paid a premium for it, which is why I don't have many "toner" coins. Too many pieces are like the Morgan Dollars that are shown in post #24. That post is a primer on what to look for if you want to avoid artificially toned coins. Here is my favorite toner in my collection. It is an 1892 Columbian Exposition half dollar. I will guarantee you that this one is natural. I bought this from a dealer friend 30 years ago. It is in a PCGS MS-63 holder. He had sent it in twice to get it in an MS-64 holder, and it failed both times. I paid $125 for it when the going price for an MS-63 was about $75. So you might say I buried myself, but for me the coin is pleasing to the eye.