For starters you have to copy the wording accurately in order to search for it successfully. That should read "Bundesrepublik Deutschland", just like it says on the coin.
There are a number of sites that give values, mintages, and other information. If you can read German, there's a link to one of the better sites below.
USSR
Deutsche Demokratische Republik
West (Bundesrepublik Deutschland) and East (Deutsche Demokratische Republik)
German Democratic Republic (GDR) In German: Deutsche Demokratische Republik (DDR)
DDR - Deutsche Demokratische Republik GDR - German Democratic Republic
East Germany (Deutsche Demokratische Republik)
Germany was divided in the Federal Republic of Germany (Bundes Republik Deutschland) also called West-Germay and the German Democratic Republic (Deutsche Demokratische Republik) , East-Germany
Prior to 1990, there were two Germanies. East Germany was the DDG, or Deutsche Demokratische Republik
DDR stands for "Deutsche Demokratische Republik", the "German Democratic Republic" (former Eastern Germany from 1949 - 1990)
Why Soviet Union has to name (or rename) some country. The country itself change its name. Germany were splitted into two parts: The DDR and BRD DDR- Deutsche Demokratisch Republik (German Democratic Republic, or so called Eastern Germany) and BRD- Bundes Republik Deutschland (German Federal Republic or so called West Germany)
The DDR (Deutsche Demokratische Republik) or in English GDR (German Democratic Republic).
Neither, East Germany (official name Deutsche Demokratishe Republik, German Democratic Republic) had borders with West Germany, Poland and Czechoslovakia.