It is from the online archive Max linked above. Until recently, they didn't have 1909 archived, but now they have 1904 through 1914 and there is a ton of great stuff in there; really worth your time to look through a few issues. As best I can tell, the first add posted above ran 7/3 through 7/24 1909. Then it was followed by this one which ran 8/21 through 9/18. After these Sporting Life stopped advertising the T206 set, probably because they were working on their own to be released in 1910.
Notice who's tucked in on the left
