Lou Gehrig 1926-29 Postcard-Back Exhibit Card Graded EX-MT 6 by PSA. Lot 25. Lou Gehrig 1926-29 Postcard-Back Exhibit Card Graded EX-MT 6 by PSA. The card shows Gehrig in a batting pose and has a photo background. A very scarce card. Winning Bid $1,391. Back to List Winning Bid $1,391 Back to List