horzverti ~
I trust you believe me when I say that my recent research was not an attempt to confirm or refute any dates, but rather because it was bugging me that I couldn't find a decent picture of the fence showing the "Wayne Knit" advertisment.
Below is another picture of Cobb at Hilltop Park. The site where I found it makes a 1911 reference to Cobb, but I'm not sure if the photo is actually from 1911 or not. I have a feeling if we look around enough we will be able to confirm all of this one way or another. But I have to admit, I am definitely leaning toward the "Wayne Knit Hosiery" fence as being at Hilltop in 1911 and not 1912.
Thanks.
Bob
Link with 1911 reference:
http://georgiainfo.galileo.usg.edu/tdgh-jul/jul04.htm