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leonThe "rarest" card is sort of a relative term. Any card with 1 known would have to be at the top, if there were no restrictions. Then 2 after that and so on..Also, we have to talk about what is classified as a card, and if this rarity "test" includes proofs , sets not in ACC , etc...? There are too many variables to say what the rarest card is other than if there is one then that has to be the rarest (and there are surly single specimans of many cards). Hal's Recius Wagner is rarer than his T206 but that doesn't make it worth more, just ask him 
? (I know you are reading Hal, and am just joking). So value has no play in this question either. By definiton the rarest ACC baseball set would have to be the T231. Being that there are only 2 known and only one physical one. After that there are numerous that come to mind, again only talking listed in the ACC. Four Base Hits is actually listed as N690 so it's in there. Just So's, Hancock Clothing, Boston Garters, etc... aren't listed as well as a lot of other cards that would fall into this category. The Niagra Baking is listed and I have only personally seen 1. (in an auction). We must qualify too if a "stamp" on the back qualifies a card as being a seperate series. If we are stict ACC people then it does. The Niagra one is a stamp on the back of a more common e card. ( I forget which one but it's an anonymous one...e101, e102 etc)...great topic...