As you can see in the images below, the factory dist., number is what makes the card real. Message board post back in 2002 confirms that without the factory dist., number on the back of a T206 card, is fake. Not authentic.
Also take a look at this 1910 map of Pennsylvania. Notice the same factory No. 25 2d . dist Va print on the map. This factory dist# is the same factory dist. # on the Cobb/Edwards Wagner card. Also take a look at some Oasis and Piedmont cigarette advertisement in the early 1900s. Once again, notice the Factory No. 25 2d. Dist. Va on the back of the Egyptian Oasis cigarette advertisement, this is the same factory dist. # as the Cobb/Edwards card. That means the Cobb/Edwards card and the Oasis cigarette photo advertisement were printed at the same factory. The factory Dist. # is the copyright on the T206 cards and is one of the signs that makes a T206 card real… See images: