After the capitulation of German Reich, several areas under Soviet occupation were given permission to issue stamps. Those provinces were:
Mecklenburg-Vorpommern (Mecklenburg-Western Pomerania):
Ost-Sachsen (East Saxony):
Provinz Sachsen (Saxony):
West-Sachsen (Western Saxony):
In 1946 they were replaced by general issues for Anglo-American
and Soviet zone.
In 1948 purpose-printed stamps for whole Russian Zone were issued. Here are some of them:
And on October 10th, 1949 German Democratic Republic (East Germany)
To see some early GDR stamps click here.