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Richard DwyerOnly boxes with 10 cigarettes were possible T206 boxes. Also the tax stamp doesn't have a date at all on it, if I remember right. Dewitt/Clinton stamps went all the way to 1956.
Here's a tax stamp that would prove without doubt there was a T206 card inside. The overprinting shows Factory 30, 2nd District, NY and has date of 1911. Factory, district, state, and year are all correct.