Posted By:
davidcyclebackThe grading companies are often hesitant to grade newly discovered cards, and can wait a good amount of time before accepting them. They often won't holder cards of which they are unfamiliar, including ones they haven't heard about. It can take a while for a legitimate card to be holdered, and they often want historical evidence and learned outside opinion to back it up.
From what I've seen, the top graders are pretty accurate with their new old card additions, and they fall on the side of caution when considering a new issue. If, as you say, one makes a new card with old paper, PSA and SGC likely will not holder it, simply because they haven't heard of it before.
I saw the Ruth Baltimore photo. It appeared to be genuine. Whether or not it qualifies as a trading card is another question.