The 1911 Western Playground Association set (referred to as H998 in The American Card Catalog) is one of the most obscure sets ever produced. The 2-1/4 x 3-1/2" cards also served as membership certificates into the "Western Playground Association," with the copy on the cards' backs explaining how teachers could redeem the cards for "School Apparatus or Playground Supplies." The cards would be sent from the teacher to the Western Playground Association in San Francisco, which explains the Pacific Coast League tie-in as a west coast company.

This, also, most likely explains why cards from this incredibly unique set are so hard to find today. Only 86 total examples from the 40-card set have ever been graded by SGC.This is the only example SGC has graded of Walt Carlisle, an outfielder that managed a 3-game cup of coffee with the 1908 Boston Red Sox, his only major league stint in a 19-year career.  He did manage to excel in the PCL and Western Leagues, where he would play as late as 1923.  This card has been graded GOOD 2 by SGC, the only example of this subject graded.