The patterns and variety of colors (quite different on each of the coins I can see) makes me think it was not the environment. I would expect a...
Very cool pair of cents!
It looks like someone was experimenting with artificially toning coins (chemicals, heat, etc) and then turned in the rejects back to the bank.
My opinion (not knowing all the details of course) would be to let go all of these if it means you can buy a coin that rarely shows up. While...
Maybe it means that it is 40.4mm but can accommodate coins .2mm in either direction (to fit anything that is 40.2-40.6)? Just a guess on my part.
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