Polish Football League (1927–1939)
== Beginnings == In the years 1921–1926, the football championships were organized in a non-league way. Firstly, there were regional games, then 9 champions of those regions were divided into 3 groups - western, southern and northern (with 3 teams in each) and finally, there were champions of these groups playing each other in the big finale.
Source: Wikipedia — Polish Football League (1927–1939) (CC BY-SA 4.0)