Unused and from the early 1910s, if you are a serious baseball postcard collector you should want this, as it appears prominently in several reference books on the topic. That’s John McGraw in the inset. The card is not attributed to any publisher; it has index number 5632 well-hidden in black on the lower right front corner. At the time of opening, in 1912, “the largest Base Ball Park in the United States,” seating 45,000. Grade: 2