D M overprints

Fischer U29-35 | Michel Dienstmarken 29-35 | Year of issue 1922-1923

Fischer U29
Michel 29
Fischer U30
Michel 30
Fischer U31
Michel 31
Fischer U32
Michel 32

Fischer U33
Michel 33
Fischer U34
Michel 34
Fischer U35
Michel 35

Translations

D M is a German abbreviation for Dienstmarke, meaning "official stamp".
Freie Stadt Danzig is German for "Free City of Danzig".