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Tom L.Hard to get much rarer than one-of-a-kind sets. Here are two examples:
1894 Alpha Photo Engraving Cards of Baltimore Orioles (14 known)
1903 (or thereabouts) Allegheny (sp?) Cards
The Alphas are all in the hands of a single collector. I believe the Alleghenys were all purchased by a single dealer, and have since been dispersed throughout the hobby.
Tom