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Big Head strip cards, originally catalogued as 1916-20 have been determined to be late teens at the earliest. This set alone knocks off some really big names: Ruth, Sisler, Rice & Hornsby.

As previously mentioned, the revised date of the Novelty Cutlery postcard set knocks off: Speaker, Eddie Collins & WaJo, some really big names there as well.

Then you have the Old Judge guys like Kid Nichols who appear in minor league uniforms although the rest of the set consists primarily of major league ballplayers. I still classify these as rookie cards for that reason, opinions are probably split 50/50 on this one.

Also, numerous W600's with Type IV mounts that are so often described as rookie cards by auction houses although they were a later print run and were produced after the E107 and Allegheny sets.

Can't forget the most obvious one, 1952 Topps Mantle. Of course, never was a rookie but you know the story.............