Posted By:
denniswhat was said in previous posts...usually the key cards in any given set are the ones with the highest value(period). top tier hall of famers.....for example in any 1960's topps baseball card set the key cards always include mantle,mays,aaron and clemente. often, a key card would be a rookie card of a hall of famer like the 67 topps set tom seaver or rod carew ,who would usually would never be considered key cards in other sets, but because these are rookie cards AND high #'s they are quite expensive.