The mark consists of a dark blue P outlined in white with light blue accents. Around the dark blue P is dark blue circle, then a light blue circle, then a thicker dark blue circle, followed by a thin white circle, a thin dark blue circle, a light blue circle and then another dark blue circle. In the thicker dark blue circle are the words PIONEER in white arcing across the top and BASEBALL LEAGUE in white arcing across the bottom of the thicker blue circle. There is a light blue ribbon with a dark blue outline on the left and right side of the circles. The left side of the ribbon has ESTD. in dark blue. The right side of the ribbon has 1939 in dark blue. There is a white line above the ribbon on the left side between the ribbon and the P in PIONEER and another white line between the ribbon on the right side and the R of PIONEER.