Strong for the grade the trio of Christy Mathewson cards in the T206 issue are among its keys. The card does possess an owner's stamp on the reverse (something we smile upon). Population Data SGC Population: 8 total graded 1 at this level 4 higher PSA Population: 8 total graded 0 at this level 8 higher* *Please note that PSA just recently began to differentiate between T206 back variations in their population reports so it is entirely possible that other examples of this card may have been graded by PSA and classified in their pop reports as "unknown back."