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Andy BaranScott and I have 5 overlapping, which means there are definitely 6 (I thought that John E might have had one), possibly 7 if Brian Daniels has one, and maybe a few others at the very most that we are not aware of. No matter what the actual number is (most likely less than 10), they are MUCH more scarce than the T206 Wagner, of which I think the population is actually closer to 100 than to 50. The best chance of finding an E107 Wagner for sale will be if a new one is discovered, since the known cards don't look to be changing hands any time soon.