I believe the main reason there are no postcards, exhibits or premiums is that PSA does not grade any boxing exhibits and very little postcards or premiums. It seems the main reason for this list is for the set registry, so it would be counter-productive to.list cards that can't be graded. Also, with most exhibits and postcards it is damn near impossible to get an exact date on most of them, so it becomes very hard to say that it is definitely a boxers first card. personally don't collect exhibits because I consider them to be postcards, which I also do not collect. Like I mentioned before it is almost impossible to date them (one of the reasons why PSA does not grade them). I don't consider postcards to be normal cards, or rookie cards for that matter, but many do and to each their own. For this list it looks like we have to follow what PSA considers a card, or rookie though.
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