T206 SGC pop question

[BruceinGa]

I just received some cards that I recently won and was looking at SGC's population web page and became a little confused.
I was looking up my Jeff Sweeney Sweet Caporal and noticed there were three entries for Jeff Sweeney Sweet Caporal, a 1909-11, a 1910 and a 1911.
I looked up another card and it was listed as a 1909, a 1909-11, a 1910 or a 1911.
What are the differenced in the cards?

[sreader3]

I believe T206 cards whose backs say "150 subjects" are identified by SGC to 1909; cards whose backs say "350 subjects" are identified to 1910; cards whose backs say "350-460 subjects" or "460 subjects" are identified to 1911; and cards whose backs do not say any of the above, i.e., assorted backs, are identified to 1909-1911.

This is not a completely accurate mapping of T206 cards to their production year but is pretty close.

Jeff Sweeney, a 350/460 subject, can be found with Sweet Caporal "350 subjects" backs which would be included in the 1910 SGC population and Sweet Caporal "350-460 subjects" backs which would be included in the 1911 SGC population. You have to sum the 1910, 1911 and 1909-1911 populations for Jeff Sweeney to get the total SGC population of his subject.

(One of you SGC T206 guys pls correct me if I'm wrong. My T206s are PSA although I have visited the SGC pop report more than a few times).

[BruceinGa]

Thanks!!
I see that PSA doesn't separate the years according to backs.

[BruceinGa]

I was reading How to Use the SGC Pop Report in ThatT206life.com and found this:
"1909 Sovereign is always Sovereign 150 and 1910 Sovereign is always Sovereign 350. The same rule holds true for Sweet Caporal, Piedmont, Cycle and American Beauty. A “1910” listing refers to a 350 series back, and a “1911” listing refers to a 460 back."

Thanks Luke!!