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fkwIm not sure exactly when the T5s were issued, the SCD says 1911. The so called "postcards" are actually not a true postcard as there is no "Postcard" ID or stampbox, they are found with a blank back (sometimes used like a postcard), or a scorecard back. These Pinkerton "postcards" are from as early as June of 1912. I have seen or owned 4 that were used as postcards and have the postal cancellation marks to prove the age (1912-1913).
Like others have said, the postcards are low quality printed photos with a redish-brownish tint. The T5's are real photographs.