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Richard DwyerA true T206 pack would have a tax stamp dated 1909-1911. It should have the right factory number, district & state as well. It should have only 10 cigarettes in a slide & shell box. Exception: Polar Bear (pouch) Ty Cobb (Tin) and El Principe De Gales (Pill box type) If it has overprinting on the tax stamp it should read 1910 or 1911.
Any overprinting before 1909 or after 1911 wouldn't have a T206 card inside. Tax stamp should be a Dewitt/Clinton. If it says "Class A 20" at the top of the tax stamp, there won't be a T206 inside.
Havn't seen a box yet on eBay in the last 2 years that doesn't match up to this info.