Should post cards be allowed in a 'Master' Registry Set?

How do you all feel about team post cards of a player to be allowed in a 'Master Player Set' Registry? Most of the player post cards that i've seen simply have the player's photograph on the front, and often nothing even on the back to identify the player--even though it's usually pretty obvious who the player is. But are post cards in the same realm as regular baseball cards, and appropriate for inclusion? Does it matter? Or do they tend to "clutter up" the 'Master set', and simply make for a more impossible task for those trying to achieve a 100% completion?
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Comments
If they grade it, and it fits their loose definition of a card, etc. issued during the player's playing days -- it is allowed in.
If you exclude team issued postcards, then why not also exclude Jay's Publishing or Dexter Press?
Nick
Reap the whirlwind.
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