I_Love_Stamps' recent thread about the banknote series had me look at mine (of course) and I remembered I had two different shades of #205.

Now, I'm not even going to pretend that one of them might be the very valuable gray brown special printing. But can someone with a Scott's Specialized Catalogue tell me if this colour variation is natural for this issue? It was a short lived issue. Would there be that much chance for such a variation? Or perhaps one is changing?