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Todd (nolemmings)The T6s are the Murad college series, and the T7 type referenced by MW are "Sports Girls", part of the Hamilton King Girls series issued by Helmar and Turkish Trophy brands.
Also, I think two of the baseball stamps series have T designations around T330-- the Piedmont and Helmar issues. Don't know if you consider those "cards" but thought I'd throw 'em in.