Posted By:
HankronAs I don't know what is the factory designation on the pack I can't comment on the T206-rightousness of the pack. This is something the potential bidder would want to inquire about before bidding.
The 1909 stamp is significant. While a tax stamp by itself (with out overprinting) cannot date a pack to a particular year, such a stamp would have appeared on many genuine T206 packs.
As Michael correctly noted, the 1909-11 designation GAI uses is a fiction. The designation is not a logical fit with what is known about the packs. A better dating would be, for example, 'circa 1909'-- translating to 'somewhere around 1909' or '1909 or there abouts.'