Posted By:
RichardI would say that postcards are cards. Images of baseball players were put on postcards to sell the postcard. Images of baseball players were inserted into cigarette packs to sell cigarettes. Images of baseball players were put on Boston Garter packaging to sell garters. People collected images of their favorite baseball player, regardless of its size or distribution. I don't think that the person who bought this and kept it (collected it) did so with the intention of mailing it.

If they did, I am glad they forgot to send it.
1907 postcards are Cobb rookies. The 1925 Exhibit is Gehrig's rookie.