Posted By:
warshawlawSomeone earlier touched on the issue: public issuance. To me, the hallmark of a "card" is whether it was issued for public consumption. A photo with a PC back that the local developer made specially for someone isn't a card because it was never meant to be distributed to the public. Don't get me wrong, they can be really nice and really collectible (I have a few myself) but they aren't what we normally think of as "baseball cards". If the 1930s Gibson was issued in connection with the team for promotional purposes, I'd say it is a "baseball card".
BTW, aren't these Toleteros "cards" really stickers? The Gilliam I purchased has a gummed back. If so, why are they "cards"?