Seems like the whole baseball card blogging world is hung up on the early Bazooka Bubble Gum cards, so here is one I made up of Jay Bruce.
The original cards were printed on the back of the box of Bazooka bubble gum boxes. they were 2 3/4″ wide by 5″ height. Much larger than standard baseball cards. 1960 saw Bazooka putting three pictures on the back with cutting lines.