Until I saw Jason's reply, I hadn't looked at the links (because it's basketball, and the heck do I know about basketball?). I have since looked at the links.
I'm conflicted, and I will present both sides here.
We do not list game cards that are simply text without pictures (Trivial Pursuit, AFPA, Stratomatic, etc.). These have player photos.
We have listed cards from games from the Pre-War era of cards. Not 100% sure if the different eras should be treated differently in this case (I know there are other things where they are, but I digress). I don't think those were produced by "trading card makers" in the sense that there were distinct card makers at that time (just not the companies we know today where that was their primary thing, so in that regard, we do treat the era differently).
Those are the reasons "for". Now the other shoe.
They are not made by a card maker, nor inserted into a card product.
They were not issued in "packs" like trading cards (if they were, even if by a non-card maker, they would qualify because then they'd be "tradable").
They do not meet any of our criteria for inclusion.
Like I said, I'm torn. They really don't meet the criteria for inclusion, but I can certainly see how they would be collectible (but just like pocket schedules and the like, collectible doesn't mean "includable").
I'm erring on the side of "don't add". Sorry.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).