The 1928 W502 issue is an enigma.  Similar in size and appearance to the ice cream cards of 1928, the W502 cards contain no information on the card which would identify the issuer.  Instead, printed on the backs of many of the cards would be "plays" in what would appear to be a baseball-related game, with individual play results printed on each card.  1928 W502 cards are also available with blank backs.  According to hobby researcher Al Crisafulli (wow, that's me), who conducted some research into this set some years ago, blank backs such as this one account for approximately half the population of W502s.  It is likely that the cards were made available by a retail store, or packaged inside some type of candy. Presented here is the key to the issue, a portrait photo of a grinning Babe Ruth. Graded VG-EX 4 by PSA, it is one of just 37 W502 Ruths they have assessed. While the card is noted by PSA as "hand cut," this is a misnomer, as the cards from the set are all uniform in size - PSA's designation is a legacy description they have not corrected, associating the ACC designation of "W" with strip cards, most of which were, indeed, hand cut.  In this case, corner wear is consistent with the grade, the image centered slightly to the right on a very minor tilt.  Still, one of Ruth's tougher cards, the key card to a fascinating set.