Bumping this thread because I found another Old Mill ad/newspaper clip to go along with the first ad I found and I think it adds credence to the pages in the ATC Ledger.
Here's the Ad From a July 30th 1909 Charlotte NC newspaper
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These dates line up perfectly with an Old Mill page in the ATC ledger.
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The top of the page is missing but I was pretty sure it was about the Southern League players and now I think we can say it is for certain because it lines up perfectly with the Old Mill Ad and newspaper clip.
We now know that they packed and shipped the Old Mills with the Southern League subjects on August 7 1909 but we can't be sure when they started printing them but it was probably in June or July 1909.
Below that it says began packing Nat'l player like those in Piedmonts packing Jan 8 1910 shipping Jan 9 1910 so the printing for the Old Mill Major League subjects probably started in November or December 1909.
and under that it states began one Nat'l and 1 Southern League picture
began packing 3/15/1910 shipping 3/17/1910
I think this is when they switched over and the group 1 150/350 subjects with the Piedmont 350 backs were inserted in the packs. If that's the case then the
printing of the Group 1 subjects with Piedmont 350 backs probably began in January or February 1910.
It also states that they discontinued packing the Old Mills on 12-10-1910 so that must be when the packing of the 460 only Old Mill major League subjects ended.
This is probably when they started packing the T210's.