In Autumn 1942, the SS concentration camp in Sachsenhausen setup a secret print shop. Main and most successful enterprises in the counterfeiting workshop was the production of counterfeit English banknotes and stamps. One of the stamps that they did counterfeit is very interesting, since it is about the allies meeting in Tehran in 1943.
Here is the original website (in German):
And here is the translation site by Google (although the English translation is not very good):
