More seriously, since the OP says "any sport", I tried to think of a few I have that would qualify. There's not many in pre-war outside of baseball. Football has the 1926 Spauldings I suppose, but pretty much all the other sports don't really have this divide between "sets that count" and "sets that don't count". CDV's and Cabinets are about all I can think of, but even many of those are labelled a "rookie card". Going off eBay every single career contemporary Jack Johnson card is a rookie.
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