Naval ensign of Poland. Based on File:Naval Ensign of Poland.svg and File:Herb PRL.svg. This was the naval ensign of the People's Republic of Poland. Officially abandoned in 1990 - so was used by 3rd Republic Navy also.
Naval Ensign of Poland.svg
Herb PRL.svg
Naval Ensign of Poland.svg: Denelson83, Mareklug, Wanted
Herb PRL.svg: Ausir, Huhsunqu
derivative work: Mboro