Worth made a few minor league balls early in the 20th Century.  I have very little information on which leagues and when, apart from a single example from my collection, a PONY League ball from the late-’40s or early-’50s.  If you have any additional information, please contact me.

One note of interest:  Worth apparently featured a baseball with the model name “Pioneer League” (see below).  This appears to be distinct from Official Pioneer League game baseballs of the time.  Be careful!  If you see a Pioneer League ball from the ’20s or ’30s, make sure it has a president’s stamp on it, or it may very well be one of these.