I tried to find the information about the black propaganda postcards issued in the USSR during the Second World War in German, Hungarian, Romanian and Finnish languages. Some of these postcards are listed in the Michel catalog under the title «Sowjetrussische Fälschungen».
The result of my study is on the website http://kontorov.net/en-f-ob-info
(in English) and http://kontorov.net/f-ob-info.html
(in Russian). All these postcards are very rare, but I think that the most rare are postcards in Hungarian, Romanian and Finnish languages, as well as postcards in German, which are not listed in the Michel catalog. I would be very grateful for any comments and corrections.