I agree with Leon's "loose" definition. If I'm collecting a player, my goal is to get one of every card and premium they have, not including modern issues. So if an item is "card-like" (a blotter, for example) or "premium-like," I feel like I would need it. For example, if I collected Criger, I would definitely need that booklet, or at least the back cover of it. Where it gets interesting is when the items start to get bigger, and sometimes it gets tougher to determine whether to consider something a premium or an advertising piece. As with everything in collecting, each collector has to come up with his own criteria.
-Ryan
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