The 1926-29 Exhibits "Postcard Back" issue is speculated to have been issued in the Philadelphia area.  Though the cards typically feature postcard backs, they are occasionally found blank, and some with the notice "Not for use in Exhibit Machines."  Further, some contain a country of origin (USA) added to the backs.  The cards can be found printed in a variety of color tints as well.  The result is a wide variety of possible variations with differing degrees of scarcity, very appealing to advanced hobbyists.

Attractive card featuring Hall of Famer Hack Wilson, in a card that, along with his 1925 W504 Universal Toy strip card, many collectors consider to be his rookie card.  Graded VG+ 3.5 by SGC, the card boasts strong eye appeal, though some foxing and minor staining on the card surface is most visible in the sky area above Wilson, particularly along the top edge.  Regardless of the wear, the card is an important early card of a popular Hall of Famer, who still holds the single-season RBI record with an astonishing 191, a record no modern player has come close to touching, steroid era or not.