I would say that finding any 1890 card isn't too hard, but finding a particular one is very tough. As I mentioned, just last year I found a Hallman PL card that was a new discovery and it's likely one of a kind. Now, he has multiple poses, so an 1890 card of Hallman isn't a one of a kind item, just that pose.
You would be hard-pressed to get multiple examples of a card like I have with Farrar, that was just dumb luck on my part and prices so good there was no way I could pass them up.
I can't put a particular number on them, but Player's League cards are in the 100's and same goes for the NL cards. Maybe 500 total exist, just a guess
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