Tremendous 1957 Kahn's Mazeroski one of his recognized "rookie cards" for which a high collector demand exists. The EX 60 grade assessed by SGC factors in the lightly rounded corners as well as some discoloration resulting from being packaged with hot dogs but the card in general is fantastic for the issue one of the higher-grade examples known. Population DataSGC Population: 5 total graded 2 at this level 1 higherPSA Population: 11 total graded 0 at this level 3 higher