"Rare" is not a universal number. It is relative to the era/subject matter. Because this is a pre-war card forum and we are all (I'm assuming) talking about pre-war cards, I would say "rare" can be 1-5 subjects. However, I would consider certain t206 oddities and variations "rare" even though there may be 10 known. This is because t206 is such a large set and, comparative to other cards within the set, this card may be rare.
I agree, the term "rare" is used way too liberally, but to assign an exact number to the term "rare" is just silly IMO.
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