I know this is an old thread, but I just ran into it! The Harvard card is part of a set of 8 postcards done in 1905 by Ullman. They were drawn by the famous artist, Earl Christy. Harvard is the only baseball card in the set with the other 7 being football cards. You can see a few of the football cards (along with a knock-off) on my page:
http://www.collectorfocus.com/collec...llege-football