Naval ensign of Poland. This ensign was used since 1919 to 1927 (practically to 1936). Correct aspect is 5:8 (in a graphic attachment to a law text there was 5:10.5, but later it was amended).
Dz.U. 1919 nr 69 poz. 416
Naval_Ensign_of_Poland.svg
Herb Polski z lat 1919-1927 vector.svg
Naval_Ensign_of_Poland.svg: Denelson83, Mareklug, Wanted
Herb Polski z lat 1919-1927 vector.svg: Ziegenpl
derivative work: Mboro (talk)