The Leather Pushers

The Leather Pushers is a 1922 American film serial starring Reginald Denny (and Billy Sullivan in the fourth series), and based on boxing stories by H. C. Witwer originally published in "Collier's Weekly". The screenplays were written by a young Darryl F. Zanuck.
Preservation status.
Only episodes 2 and 3 exist, along with a trailer for the series.