This set of 33 cards was issued in three color-coded series by the Red Heart Dog Food Co. Card fronts feature hand-colored photos on either a blue, green or red background. The 11 red-background cards are scarcer than the 11-card blue or green series. Backs of the 2-5/8" X 3-3/4" cards contain biographical and statistical information along with a Red Heart ad. Each 11-card series was available via a mail-in offer. As late as the early 1970s, the company was still sending cards to collectors who requested them. Very nice example with minor print marks in upper right corner. Bright red with strong corners. The Ashburn, above, has been graded NM by PSA.