Posted By:
Steve DawsonIn a nutshell, it seems to me that Beckett feels the "RC" (rookie card) designation can only be given to a card from a "mainstream, nationally issued" set. They evidently feel that all the E, M, etc cards are not nationally issued, and were only regional issues. Therefore, no cards from these sets can be officially recognized as "rookie cards".
Edited to add that I just this weekend looked at a Beckett Rookie Card Encyclopedia, and remember seeing a statement in it along the lines that they won't officially designate a card as a "RC" if it comes from a set that was issued over a number of years. In other words, a set must be a single-year issue to have any of it's cards recognized as a "RC".
Steve