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Mike12 or less in existance has always been my idea of rare. Not that I would draw the line, if 13 of something are known to exist. I have quite a few cards where there are twelve or less known. Many years ago I picked up a Nadja Bresnahan after the 12 were discovered in St. Louis. That's kind of where I came up with the figure 12. Just kind of a random number I came up with. Nothing more, nothing less.