In 1943, the British produced these parodies of Italian issues featuring Hitler & Mussolini.
On MiNr. 49, the faces are changed to a snarling Hitler and cowering Mussolini, and the text is changed from “Duo popoli / Un guerra” (“Two peoples, one war”) to “Duo popoli / Un führer” (“Two peoples, one leader”).
On MiNr. 50, the text is changed from “Poste Italiane.” to the German text “Zwei Volker / Ein Krieg” (“Two peoples, one war”). The color is also changed, from the original purple to green.
For more on these issues, see Propaganda and Espionage Philately, by SGM Herbert A. Friedman (Ret.).