D M overprints

Fischer U36-40 | Michel Dienstmarken 36-40 | Year of issue 1923

Fischer U36
Michel 36
Fischer U37
Michel 37
Fischer U38
Michel 38

Fischer U39
Michel 39
Fischer U40
Michel 40

Translations

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