Posted By:
ParkerJGreat points by Jon Canfield, and JimB. If we consider that the manufacturer was actually Amer Litho, then doesn't that cloud the whole "group by mfg" argument?
I would consider the broader definition of T206 to be any white-border, brown letter, card printed by ALC and inserted with ATC tobacco products from 1909-1911. Importantly, I do not believe this expansive definition actually changes the size of a "t206" set beyond the current 524 cards - there are no front images in the t213-1 which are unique from t206. It only expands the size of the "master" set, and that only affects Ted
.
We should consider that by the time Burdick classified this set and named it as "T206" (in ACC #1, 1939) collectors had already been collecting it in some form for over 30 years. So I would imagine he must have taken some consideration of how the collectors of that day had already classified these cards together and differentiated them from other sets. It might have been as innocuous and arbitrary as him finding that by 1939 all the people he knew who collected the coupon cards (I,II, and III) happened to group them together as a single set.
Just my 2 cents.
Edited: typo.