Some detective work turned up what the DDR possibly stands for:
Deutsche Demokratische Republik (DDR), often known in English as East Germany, existed from 1949 to 1990
Following the end of the Second World War, Germany was carved up, to be occupied by the US, UK, France and the Soviet Union. In 1949, the Deutsche Demokratische Republik (German Democratic Republic in English) was established in the Soviet-occupied eastern side of Germany.
DDR, as it was colloquially known, was effectively a satellite state of the Soviet Union, and as the westernmost edge of the Soviet bloc, became the focal point for Cold War tensions until its dissolution in 1990.
So, now that I have a country of origin, just need to figure out the maker's mark
Worked on cleaning it up a little, so here it is