As always, this subject creates an interesting debate. I'm on board with both Adam's/Kevin's and Jay's definition. However, if we take the any baseball image is a card definition, we need to include the handful of baseball images that were made before 1860. These would include tintypes, ambrotypes,and salt prints. This would also includes the Knickerbocker daguerreotype, if you consider it to actually depict members of that club.
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