>> Freie Stadt Briefmarken Druckerei.
Serie 1, The Berlin Overprints of 1920.
Historic Notes: Danzig became a Free City on 15 November 1920. Poland controlled Danzig's foreign affairs, owned its railroads, operated the harbor post office and won the right to maintain and use the munition depot on Westerplatte.
Danzig Report, No. 138, Page 5.
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