As a 19th century guy like Joe I find rare to be a very overused term. I would say at the least, to be considered rare, there must be 10 or less of a particular card. Many 19th century cards are rare, but that's why very few 19th century sets can be completed. I also dislike the term "condition rarity". A condition rarity is usually no more than a high grade example of an easily found card.
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