Following on the heels of the ultra-difficult and ultra-puzzling W502 set of 1928 came a virtually identical set in 1931.  Also classified in the ACC as W502, the 1931 issue features the same design as the 1928 issue (and in some cases, the same player selection) with the identical baseball game plays printed on the card backs.  Significantly more scarce than the 1928 issue, high-grade examples are virtually impossible to find.  This is a stunning portrait image of Gehrig, well-centered and sharp, with a clean surface.  The technical grade is likely the result of lightly-touched corners.  Despite this, one of Gehrig's tougher cards (PSA has graded just five examples), from an extremely tough issue.